Good news: The most popular material on Earth is great for storing CO2
But the most promising concrete technologies utilize very little energy to incorporate CO2. That’s because when CO2 is incorporated into concrete, it’s literally piped into the mix. The natural tumbling motion of churning concrete is all the energy that’s needed to transform the CO2 into a calcium carbonate, a substance that doesn’t just act as filler but also actively strengthens the concrete mix. All of this tough calcium carbonate means the concrete needs less cement in its mix, which is another environmental savings, since cement is the worst polluting component of concrete.