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Extreme storms, like recent ones in the US, follow a recipe

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Friday, April 11, 2025

Extreme storms, like those that hit the central U.S. in early April, follow a recipe. Image via Kelly Sikkema/ Unsplash. Extreme storms form thanks to moisture and atmospheric instability. These two ingredients are common in the central U.S. in spring. Climate change means more warm air, and warm air holds more moisture, leading to wetter and stronger storms. The most significant warming occurs near the surface, while the upper atmosphere is cooling. This can increase the instability that triggers strong storms. By Shuang-Ye Wu, University of Dayton Extreme storms have been hitting the central US A powerful storm system that stalled over states from Texas to Ohio for several days in early April 2025 wreaked havoc across the region. It brought deadly tornadoes, mudslides and flooding as rivers rose. More than a foot (30 cm) of rain fell in several areas. As a climate scientist who studies the water cycle, I often get questions about how extreme storms like these form and what climate change has to do with it. There’s a recipe for extreme storms, with two key ingredients. We’ve never needed good science more than we do right now. Support EarthSky in 2025 and help us keep it going strong. Severe storms hammered parts of the central U.S. in early April. The National Weather Service issued 309 flash flood warnings between April 2 and April 7. Image via IEM/ Matthew Cappucci. Recipe for a storm The essential conditions for storms to form with heavy downpours are moisture and atmospheric instability. First, in order for a storm to develop, the air needs to contain enough moisture. That moisture comes from water evaporating off oceans, lakes and land, and from trees and other plants. The amount of moisture the air can hold depends on its temperature. The higher the temperature, the more moisture air can hold, and the greater potential for heavy downpours. This is because at higher temperatures water molecules have more kinetic energy and therefore are more likely to exist in the vapor phase. The maximum amount of moisture possible in the air increases at about 7% per degree Celsius. Warm air also supplies storm systems with more energy. When that vapor starts to condense into water or ice as it cools, it releases large amount of energy, known as latent heat. This additional energy fuels the storm system, leading to stronger winds and greater atmospheric instability. Atmospheric instability That leads us to the second necessary condition for a storm: atmospheric instability. Atmospheric instability has two components: rising air and wind shear, which is created as wind speed changes with height. The rising air, or updraft, is essential because air cools as it moves up. And as a result, water vapor condenses to form precipitation. As the air cools at high altitudes, it starts to sink. This forms a downdraft of cool and dry air on the edge of a storm system. When there is little wind shear, the downdraft can suppress the updraft, and the storm system quickly dissipates as it exhausts the local moisture in the air. However, strong wind shear can tilt the storm system. Then the downdraft occurs at a different location, and the updraft of warm moist air can continue, supplying the storm with moisture and energy. This often leads to strong storm systems that can spawn tornadoes. Extreme downpours hit the US It is precisely a combination of these conditions that caused the prolonged, extensive precipitation that the Midwest and Southern states saw in early April. The Midwest is prone to extreme storms, particularly during spring. Spring is a transition time when the cold and dry air mass from the Arctic, which dominates the region in winter, gradually gets pushed away by warm and moist air from the Gulf that dominates the region in summer. This clash of air masses creates atmosphere instability at the boundary, where the warm and less dense air gets pushed upward above the cold and denser air, creating precipitation. A cold front forms when a cold air mass pushes away a warm air mass. A warm front forms when the warm air mass pushes to replace the cold air mass. A cold front usually moves faster than a warm front, but the speed is related to the temperature difference between the two air masses. The warm conditions before the April storm system reduced the temperature difference between these cold and warm air masses, greatly reducing the speed of the frontal movement and allowing it to stall over states from Texas to Ohio. The result was prolonged precipitation and repeated storms. The warm temperatures also led to high moisture content in the air masses, leading to more precipitation. In addition, strong wind shear led to a continuous supply of moisture into the storm systems, causing strong thunderstorms and dozens of tornadoes to form. What global warming has to do with storms As global temperatures rise, the warming air creates conditions that are more conducive to extreme precipitation. The warmer air can mean more moisture, leading to wetter and stronger storms. And since most significant warming occurs near the surface, while the upper atmosphere is cooling, this can increase wind shear and the atmospheric instability that sets the stage for strong storms. Polar regions are also warming two to three times as fast as the global average, reducing the temperature gradient between the poles and equator. That can weaken the global winds. Most of the weather systems in the continental U.S. are modulated by the polar jet stream. So a weaker jet stream can slow the movement of storms, creating conditions for prolonged precipitation events. All of these create conditions that make extreme storms and flooding much more likely in the future. Shuang-Ye Wu, Professor of Geology and Environmental Geosciences, University of Dayton This article is republished from The Conversation under a Creative Commons license. Read the original article. Bottom line: Extreme storms brought tornadoes and flooding to the central U.S. in early April. Climate scientist Shuang-Ye Wu explains the recipe for severe storms and why a warming world can make them more frequent. Read more: Extreme weather: We haven’t seen the worst yet The post Extreme storms, like recent ones in the US, follow a recipe first appeared on EarthSky.

Extreme storms hit the central U.S. in early April. A climate scientist explains the recipe for severe storms and why a warming world makes them more frequent. The post Extreme storms, like recent ones in the US, follow a recipe first appeared on EarthSky.

Extreme storms: A sign showing an upcoming stoplight that is mostly underwater.
Extreme storms, like those that hit the central U.S. in early April, follow a recipe. Image via Kelly Sikkema/ Unsplash.
  • Extreme storms form thanks to moisture and atmospheric instability. These two ingredients are common in the central U.S. in spring.
  • Climate change means more warm air, and warm air holds more moisture, leading to wetter and stronger storms.
  • The most significant warming occurs near the surface, while the upper atmosphere is cooling. This can increase the instability that triggers strong storms.

By Shuang-Ye Wu, University of Dayton

Extreme storms have been hitting the central US

A powerful storm system that stalled over states from Texas to Ohio for several days in early April 2025 wreaked havoc across the region. It brought deadly tornadoes, mudslides and flooding as rivers rose. More than a foot (30 cm) of rain fell in several areas.

As a climate scientist who studies the water cycle, I often get questions about how extreme storms like these form and what climate change has to do with it. There’s a recipe for extreme storms, with two key ingredients.

We’ve never needed good science more than we do right now.
Support EarthSky in 2025 and help us keep it going strong.

Map of the US with many overlapping red rectangles near the center.
Severe storms hammered parts of the central U.S. in early April. The National Weather Service issued 309 flash flood warnings between April 2 and April 7. Image via IEM/ Matthew Cappucci.

Recipe for a storm

The essential conditions for storms to form with heavy downpours are moisture and atmospheric instability.

First, in order for a storm to develop, the air needs to contain enough moisture. That moisture comes from water evaporating off oceans, lakes and land, and from trees and other plants.

The amount of moisture the air can hold depends on its temperature. The higher the temperature, the more moisture air can hold, and the greater potential for heavy downpours. This is because at higher temperatures water molecules have more kinetic energy and therefore are more likely to exist in the vapor phase. The maximum amount of moisture possible in the air increases at about 7% per degree Celsius.

Warm air also supplies storm systems with more energy. When that vapor starts to condense into water or ice as it cools, it releases large amount of energy, known as latent heat. This additional energy fuels the storm system, leading to stronger winds and greater atmospheric instability.

Atmospheric instability

That leads us to the second necessary condition for a storm: atmospheric instability.

Atmospheric instability has two components: rising air and wind shear, which is created as wind speed changes with height. The rising air, or updraft, is essential because air cools as it moves up. And as a result, water vapor condenses to form precipitation.

As the air cools at high altitudes, it starts to sink. This forms a downdraft of cool and dry air on the edge of a storm system.

When there is little wind shear, the downdraft can suppress the updraft, and the storm system quickly dissipates as it exhausts the local moisture in the air. However, strong wind shear can tilt the storm system. Then the downdraft occurs at a different location, and the updraft of warm moist air can continue, supplying the storm with moisture and energy. This often leads to strong storm systems that can spawn tornadoes.

Extreme downpours hit the US

It is precisely a combination of these conditions that caused the prolonged, extensive precipitation that the Midwest and Southern states saw in early April.

The Midwest is prone to extreme storms, particularly during spring. Spring is a transition time when the cold and dry air mass from the Arctic, which dominates the region in winter, gradually gets pushed away by warm and moist air from the Gulf that dominates the region in summer.

This clash of air masses creates atmosphere instability at the boundary, where the warm and less dense air gets pushed upward above the cold and denser air, creating precipitation.

A cold front forms when a cold air mass pushes away a warm air mass. A warm front forms when the warm air mass pushes to replace the cold air mass. A cold front usually moves faster than a warm front, but the speed is related to the temperature difference between the two air masses.

The warm conditions before the April storm system reduced the temperature difference between these cold and warm air masses, greatly reducing the speed of the frontal movement and allowing it to stall over states from Texas to Ohio.

The result was prolonged precipitation and repeated storms. The warm temperatures also led to high moisture content in the air masses, leading to more precipitation. In addition, strong wind shear led to a continuous supply of moisture into the storm systems, causing strong thunderstorms and dozens of tornadoes to form.

What global warming has to do with storms

As global temperatures rise, the warming air creates conditions that are more conducive to extreme precipitation.

The warmer air can mean more moisture, leading to wetter and stronger storms. And since most significant warming occurs near the surface, while the upper atmosphere is cooling, this can increase wind shear and the atmospheric instability that sets the stage for strong storms.

Polar regions are also warming two to three times as fast as the global average, reducing the temperature gradient between the poles and equator. That can weaken the global winds. Most of the weather systems in the continental U.S. are modulated by the polar jet stream. So a weaker jet stream can slow the movement of storms, creating conditions for prolonged precipitation events.

All of these create conditions that make extreme storms and flooding much more likely in the future.The Conversation

Shuang-Ye Wu, Professor of Geology and Environmental Geosciences, University of Dayton

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Bottom line: Extreme storms brought tornadoes and flooding to the central U.S. in early April. Climate scientist Shuang-Ye Wu explains the recipe for severe storms and why a warming world can make them more frequent.

Read more: Extreme weather: We haven’t seen the worst yet

The post Extreme storms, like recent ones in the US, follow a recipe first appeared on EarthSky.

Read the full story here.
Photos courtesy of

As UN Climate Talks Loom in Brazil, Many Would-Be Participants Fear They Can't Afford to Attend

With less than two months until this year's United Nations climate change conference, many prospective attendees are still looking for housing in the small Brazilian host city of Belem

Pooja Tilvawala knows it's a gamble to use more than $46,000 of her own savings to help young people get to the United Nations climate summit in Brazil. But she thinks it’s a necessary one.As national delegations, activists and other attendees struggle to find affordable places to stay by November, with some deciding not to go at all, Tilvawala, who lives in London, has spent hours working from afar to find lodging in Belem, negotiate prices and contracts and put down deposits. She did all that to create a housing portal specifically for young people who want to be part of the international conference. If not enough people sign up for the housing she’s secured, she might lose some of what she’s put down. “There’s always a huge number of fossil fuel company representatives there. And who’s going to be there to combat those voices and those negotiating influences?” said Tilvawala, founder and executive director of the global organization Youth Climate Collaborative. “So I was like, ‘We need to be here.’”With less than two months before this year's Conference of the Parties, or COP30, only about 36% of the 196 participating countries have confirmed attendance and paid for accommodations, according to a spokesperson for the conference presidency. Activists and poorer nations are feeling the crunch as hotel prices have skyrocketed and even private homes, love motels and other makeshift accommodation options are charging a minimum of several hundred dollars a night. Many haven't confirmed housing yet, and the pressure is on The Brazilian government has taken steps to address the problem. Climate Minister Marina Silva said 10 to 20 rooms have been made available “at accessible prices” for vulnerable countries. The government has also brought in two large cruise shops that can house as many as 6,000 people. “Everybody will have access to participate in COP30," Silva said at a recent press briefing. “Facing climate change must be done by all of us, by all the parties of the convention and especially by those who are already living the consequences of climate change.”But U.N. Climate Change executive secretary Simon Stiell sent a letter on Sept. 9 asking that agencies in the U.N. system, and related organizations, review how many people they're sending to COP30 and reduce it where possible.To add to the pressure, a construction workers’ strike started Sept. 15 and includes areas being worked on for COP30. A challenge for a city chosen to illustrate climate realities Belem was initially excited to host the conference, said Arnaldo Vaz Neto, a Brazilian financial advisor who has been working with an organization called the Young Scholars Initiative as an intermediary between locals and COP30 visitors seeking housing. “It’s kind of taught in our childhood to have this behavior of hospitality," he said. But that was followed by the realization that the United Nations had high international standards for its guests. It was difficult to manage expectations on both sides, Vaz Neto said.Belem isn't the only city hosting a U.N. climate conference where lodging rates have gone far higher than usual. Silva said it's happened at nearly all such conferences, with prices three or even four times market rates.“A lot of people here are expecting to charge $1,000 a night but that’s beyond the average,” Hugo Pinheiro, a secretary who works for K Pine Mobile in Belem, and has worked to match delegations with housing and to negotiate on prices.The “accessible” rooms made available by the Brazilian government will rent for between $200 and $600 a night, according to a COP30 presidency spokesperson. Brazilian officials have expressed confidence that all 196 nations will find housing and come to Belem. In a statement, the presidency said it expects 50,000 participants and Belem currently offers 53,000 beds. That's fewer people than recent COPs, even though the Brazil meeting is considered one of the most important negotiations in years because countries have to update and strengthen their carbon pollution plans. Still, housing is making it more difficult for people from some poorer countries and Indigenous groups to attend, as well as for those that traditionally attend COP outside of a country delegation, including activists, NGO and nonprofit groups and youth observers. Some organizations that represent them expect to send fewer people.Hailey Campbell leads Care About Climate, a youth-oriented NGO that was one of the first of its kind to be accredited to attend COP over 10 years ago. Campbell said her group has “never faced such difficulties with access to accommodation." The group posted about the issue on Instagram with the hashtag “#DontPriceUsOut.”Many individual attendees have already decided they can't come. Others are on the fence. Some who will attend are considering options like camping in a tent.This year Hikaru Hayakawa said he's heard from more people who have decided not to go than he remembers at this time in years past — already maybe 30 or 40 people, by his estimate.That's worrisome because many activists from other countries will now miss out on experiencing the strong civil society culture in Brazil, said Hayakawa, executive director of Climate Cardinals, which translates climate information and trains young people. “It could potentially be lost opportunity to build these global networks," he said.The Associated Press’ climate and environmental coverage receives financial support from multiple private foundations. AP is solely responsible for all content. Find AP’s standards for working with philanthropies, a list of supporters and funded coverage areas at AP.org.Copyright 2025 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.Photos You Should See – Sept. 2025

New York Eyes Record Climate Week Despite Trump Attacks on Green Agenda

By Simon Jessop, Katy Daigle and Kate Abnett(Reuters) - When Climate Week kicks off on Sunday in New York City, it will mark the event’s biggest...

By Simon Jessop, Katy Daigle and Kate Abnett(Reuters) - When Climate Week kicks off on Sunday in New York City, it will mark the event’s biggest year yet – with organizers reporting a record number of companies participating and more events than ever to attend.Almost no one had expected this response in a year that has seen the event’s host country – and the world’s wealthiest – set to a climate-denying agenda of boosting fossil fuels, rolling back pollution regulation and defunding U.S. science and climate action.Organizers of Climate Week even wondered, “Would people show up?” said Climate Group Chief Executive Officer Helen Clarkson.“Actually, there's huge enthusiasm for it," Clarkson said.Held alongside the U.N. General Assembly since 2009, this year’s Climate Week showcases more than 1,000 events – including presentations, panel discussions and swanky cocktail parties – hosted by environmental nonprofits, companies and philanthropists hoping to generate deals and discussion around protecting the planet.Last year’s Climate Week, by comparison, saw about 900 events.The boost in engagement has come “precisely as an antidote to the current U.S. administration’s attitude toward climate change,” former U.N. climate chief Christiana Figueres told Reuters in an interview.Ten years ago, Figueres helped to craft the 2015 Paris Treaty under which countries agreed to hold the global temperatures to within 2 degrees Celsius of the preindustrial average while aiming for a more ambitious target of 1.5 degrees Celsius.But while national governments were pushing the climate agenda 10 years ago, Figueres said, the situation has since drastically changed.“The pull now is coming from stakeholders, from the real economy, from market forces that are pulling forward,” Figueres said.The Swiss carbon capture firm Climeworks has booked itself for nearly four times the number of events this year compared with last year, after the company in February raised $162 million toward improving its technology and growing the company, Co-Chief Executive Christoph Gebald said."We're continuing to see demand increase for carbon removals,” Gebald said. For Climate Week, "the level of interest from the most senior levels of companies is higher than ever.”Many major fossil fuel companies and some oil-dependent governments, however, have made moves toward reversing previous climate commitments.With the U.N. General Assembly meeting at the same time, Climate Week has developed into a major networking opportunity for CEOs and investors to rub elbows with visiting world leaders.The Assembly will take up the climate change issue on Wednesday, when Secretary-General Antonio Guterrez hosts a special “climate summit.” Many leaders are expected to announce new climate targets, or Nationally Determined Contributions.Neither the U.S. nor the European Union will be among them, despite having acted as leaders of the global climate agenda in the past. Instead, China, COP30 host Brazil and other fast-developing nations have taken a more active role in setting the agenda.China’s emissions-reduction plan could also be announced any day but may underwhelm on ambition, climate sources said.Meanwhile, the European Union is still struggling to reach agreement about how ambitious those targets should be – raising tensions about whether Brazil’s COP30 summit starting in only seven weeks will succeed."Historically, Europe has been in the front, both when it comes to taking ambitious targets ... also on the financial side of the international agreements," Danish climate minister Lars Aagaard said. But "Europe's role in the world has changed. We are 6% of global emissions. So therefore, there is also a call from our side that all parties to the Paris Agreement also should lift their responsibility." The region is nevertheless seeing fast progress in its energy transition, with the EU projecting a 54% reduction in its greenhouse gas emissions by 2030 from 1990 levels - meaning member countries are nearly on track for the EU's previous 55% target for 2030.With leaders at November’s COP30 set to focus on boosting implementation of promises made in the past, experts say companies need to be in the conversation now.More than half of the world's biggest companies have pledged to reach net-zero emissions by mid-century, in line with the world's climate goal, according to data from the non-profit Net-Zero Tracker.But according to an analysis by the TPI Global Climate Transition Centre at the London School of Economics and Political Science, a whopping 98% of companies have shared no plans for aligning their spending with those commitments."The challenge for New York Climate Week and beyond is to ensure that individuals and institutions come together in new ways to reimagine how we can cooperate against common threats," said Rajiv Shah, president of The Rockefeller Foundation.A survey released on Thursday by the foundation that questioned 36,348 people worldwide estimated that most of the world’s population - a full 86% - believed international cooperation was crucial for climate action.(Reporting by Simon Jessop in London, Katy Daigle in Washington, D.C., and Kate Abnett in Brussels; Additional reporting by Axel Threlfall in London; Editing by Mark Porter)Copyright 2025 Thomson Reuters.

Key oceans treaty crosses threshold to come into force

Sixty states have ratified a global treaty to protect the oceans - it will become law in January.

A global agreement designed to protect the world's oceans and reverse damage to marine life is set to become international law. The High Seas Treaty received its 60th ratification by Morocco on Friday, meaning that it will now take effect from January.The deal, which has been two decades in the making, will pave the way for international waters to be placed into marine protected areas.Environmentalists heralded the milestone as a "monumental achievement" and evidence that countries can work together for environmental protection."Covering more than two-thirds of the ocean, the agreement sets binding rules to conserve and sustainably use marine biodiversity," United Nations Secretary-General Antonio Guterres said.Decades of overfishing, pollution from shipping and warming oceans from climate change have damaged life below the surface. In the latest assessment of marine species, nearly 10% were found to be at risk of extinction, according to the International Union for Conservation of Nature (IUCN).Three years ago countries agreed that 30% of the world's national and international waters - high seas - must be protected by 2030 to help depleted marine life recover.But protecting the high seas is challenging. No one country controls these waters and all nations have a right to ship and fish there. Currently just 1% of the high seas are protected, leaving marine life at risk from overexploitation. So, in 2023 countries signed the High Seas Treaty pledging to put 30% of these waters into Marine Protected Areas.But it was only able to enter force if more than 60 nations ratified it - meaning they agreed to be legally bound by it. With many nations requiring parliament approval, ratification can often take more than five years, Elizabeth Wilson, senior director for environmental policy at environmental NGO The Pews Charitable Trust, told the BBC at the UN Oceans Conference earlier this year. She said this was "record time". The UK introduced its bill for ratification to Parliament earlier this month. Kirsten Schuijt, director general of WWF International, hailed "a monumental achievement for ocean conservation" after the treaty threshold was reached. She added: "The High Seas Treaty will be a positive catalyst for collaboration across international waters and agreements and is a turning point for two-thirds of the world's ocean that lie beyond national jurisdiction."Mads Christensen, executive director of Greenpeace International, called it "a landmark moment" and "proof that countries can come together to protect our blue planet". "The era of exploitation and destruction must end. Our oceans can't wait and neither can we," he added.Once the treaty comes into force, countries will propose areas to be protected, and these will then be voted on by the countries that sign up to the treaty.Critics point out that countries will conduct their own environmental impact assessments (EIA) and make the final decision - although other countries can register concerns with the monitoring bodies.The ocean is crucial for the survival of all organisms on the planet. It is the largest ecosystem, is estimated to contribute $2.5 trillion to world economies, and provides up to 80% of the oxygen we breathe.

Newsom signs slate of climate, energy bills in California

California Gov. Gavin Newsom (D) on Friday signed a slate of bills regarding climate and clean energy in an effort to “lower electricity costs, stabilize the petroleum market and slash air pollution.” The measures signed into law include legislation to increase climate credits on utility bills, expand regional power markets out West, add $18 billion...

California Gov. Gavin Newsom (D) on Friday signed a slate of bills regarding climate and clean energy in an effort to “lower electricity costs, stabilize the petroleum market and slash air pollution.” The measures signed into law include legislation to increase climate credits on utility bills, expand regional power markets out West, add $18 billion to the California Wildfire Fund and allocate $1 billion annually to a high-speed rail project.  The cap-and-trade program, now to be known as “cap-and-invest,” was reauthorized through 2045, "making polluters pay for projects that support our most impacted communities, Newsom said in a statement. “We've got to manifest our ideals and our goals. And so this lays it out, but it lays it out without laying tracks over folks…the issue of affordability, as you heard, is top of mind,” Newsom said during a Friday signing event.  Amid the onset of refinery closures in the state, the governor approved a Republican-backed bill to support more offshore drilling in Kern County, an area rich with fossil fuel resources. Republican state Sen. Shannon Grove said the legislation will “stabilize fuel prices for all Californians” during a speech on the floor last week. The legislative package also earned applause from environmental advocates who have celebrated efforts by Newsom. “We applaud Governor Newsom and California legislators for leading the way in cutting pollution, lowering bills, and building more resilient communities. Now we must accelerate this kind of progress in California and across the nation to meet the full scale of the climate crisis,” Evergreen Action vice president for states Justin Balik said in a Friday statement. The California governor said Friday the state will push forward to lead the nation with “practical application business.” “We're getting it done here today,” Newsom said. “So finding a balanced approach, setting forth strategies to achieve audacious goals that simply no other large-scale jurisdiction in the world can lay claim to, and doing it in a way that reduces the burden on ratepayers and taxpayers.”

Newsom signs climate overhaul, extending cap and trade while boosting oil drilling

A set of laws Gov. Gavin Newsom signed today extends California clean-energy programs while taking steps to shore up oil and gas production. It also opens the door to a Western energy grid.

In summary A set of laws Gov. Gavin Newsom signed today extends California clean-energy programs while taking steps to shore up oil and gas production. It also opens the door to a Western energy grid. Gov. Gavin Newsom today signed a sweeping package of climate and energy policies to extend the cap-and-trade greenhouse gas emissions program, increase oil drilling and allow the state to create a Western regional electricity market.  The overhaul that Newsom and top lawmakers negotiated in the final days of the legislative session amid heavy lobbying last week reflects urgency in the Democratic Party to preserve its climate goals while simultaneously reining in the surging gas and energy costs that have threatened to drive voters to the right.  Lawmakers opened the session this year declaring a focus on making California more affordable, following a bruising national election for Democrats. The energy package was central to that goal, with progressives proposing to lower costs with industry regulations. But after two years declaring special sessions targeting the oil and gas industry, Newsom began to warm up to them as oil refineries announced closures that could send gas prices spiking. As a result, one of the bills he signed Friday would boost domestic oil production in Kern County by approving a long-delayed environmental impact report for new wells.  “We have to effectively transition,” Newsom said at an event in San Francisco. “This is not an ideological endeavor. We’re in the practical application business. We’ve got to manifest our ideals and our goals. So this lays it out. But it lays it out without laying tracks over folks.” The biggest part of the complex package he signed were bills to extend the state’s cap and trade program, which since 2013 has put a price tag on carbon emissions. The program caps the amount of greenhouse gases that polluting industries can emit, and to a limited extent allows companies that cut emissions to sell permits to other companies that pollute. The program raises money for many of the state’s climate programs.  The extension leaves the program largely the same, which disappointed environmental justice advocates who argued it has allowed oil and gas to continue polluting near low-income communities. In a nod to those concerns, Newsom also signed another bill in the package that creates a state fund to monitor pollution mitigation in disadvantaged communities. He also signed two bills affecting the electricity grid. One would allow the state to create a Western regional energy market, allowing the state to trade more electricity with neighbors.  Proponents, including mainstream environmental groups, say the idea would lower prices by allowing California producers to sell excess clean energy during times the state doesn’t need it — when it’s sunny, but not hot, for example, while importing power during heat waves and other high-demand times.  The other bill aims to lower the cost of transmission infrastructure for customers by setting up a public financing system for building new power lines. It would also prevent some utilities’ wildfire mitigation costs from being passed on to customers, and replenish the state’s wildfire fund by $18 billion. The money, paid by shareholders and ratepayers over the next decade, is used to pay wildfire victims.  The package Newsom signed leaves one imminent concern unaddressed: upcoming refinery closures. Negotiations late in the legislative session to keep two Bay Area refineries open have so far failed to produce any deals.  Some Democrats simply didn’t want to give more to the oil industry, while others disagreed on how much support the state should provide, Assemblymember Lori Wilson, a Suisun City Democrat, told CalMatters last week. Wilson had been pushing for the state to support the Valero refinery in Benicia that is now set to close by the end of the year without a deal, costing the city its largest private employer.  Cayla Mihalovich is a California Local News fellow.

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