There is, however, an amazingly elegant natural process to extract carbon from the air: Photosynthesis. Powered by the sun, it compacts the gas CO2 into solids and turns it into carbohydrates. Which is why trees are sometimes used to offset emissions. The problem is once that tree decomposes, all the CO2 is released back into the atmosphere. If we can stabilize this carbon so it doesn't revert back to CO2, we can safely set it aside, grow more, and repeat the process until we have sequestered enough carbon.