Global Thermostat sounds too good to be true: It's a startup company that aims to address the threat of climate change by capturing carbon dioxide from the air, and then making productive use of it.
The CO2 could be used to help plants grow faster in greenhouses, as a feedstock for algae, for enhanced oil production, as an ingredient in bottling plants, as a natural refrigerant, or as a circulating fluid in a geothermal energy installation.
While Global Thermostat calls itself "a carbon negative solution," its technology is in practice a form of geoengineering. It would appear, however, to be less risky than better-known geoengineering techniques such as solar radiation management or marine cloud whitening.
"We've faced skepticism about the solution because it's so radical," says Graciela Chichilnisky, a co-founder and managing director of Global Thermostat. But, she says, a carbon negative solution to the climate crisis will be needed "to contain rising levels of atmospheric carbon because we procrastinated too long and carbon emissions reductions do not suffice."