CO2 Sequestration
A satirical proposal. In the wake of the EPA classifying CO2 as a harmful gas, I propose we sequester it at one of the most abundant sources on the planet: oxygen-breathing mammals.
A simple disposable mask that combines exhaled CO2 into inorganic calcium carbonate, with a dye to show when it's full so it can be buried forever. Call it a Personal Carbon Catcher. Surely it would qualify for a carbon credit. Imagine the quantity drawn out of the atmosphere if all mammals did their part. It boggles the mind.