Akshat Rathi October 12, 2017 read full Quartz article here
…We produce 40 trillion kg of carbon dioxide each year, and we’re on track to cross a crucial emissions threshold that will cause global temperature rise to pass the dangerous 2°C limit set by the Paris climate agreement.
…On Oct. 11, at a geothermal power plant in Iceland, the startup inaugurated the first system that does direct air capture and verifiably achieves negative carbon emissions. Although it’s still at pilot scale—capturing only 50 metric tons CO2 from the air each year, about the same emitted by a single US household—it’s the first system to convert the emissions into stone, thus ensuring they don’t escape back into the atmosphere for the next millions of years.
…Climeworks and Global Thermostat have piloted systems in which they coat plastics and ceramics, respectively, with an amine, a type of chemical that can absorb CO2. Carbon Engineering uses a liquid system, with calcium oxide and water. …
…Each of the startups has built a functional pilot plant to prove their technology, with the ability to capture hundreds of kg of CO2. And all boast that their tech is modular, meaning they can build a direct air capture plant as small or large as somebody is ready to pay for. Even at $50 per metric ton of capturing emissions, if we have to capture as much as 10 billion metric tons by 2050, we are looking at spending $500 billion each year capturing carbon dioxide from the air. It seems outrageous, but it may not be if climate change’s other damages are put in perspective—and that’s what these startups are betting on….