Just as there are lots of ways to add CO2 to the air, there are lots of ways—potentially—to remove it. A technique known as “enhanced weathering” is a sort of upside-down version of the project I toured at the Hellisheiði Power Station. Instead of injecting CO2 deep into rock, the idea is to bring the rock up to the surface to meet the CO2. Basalt

... See more

But governments, including my own in the UK, have spent substantial amounts on research that, while scientifically interesting, sends very wrong messages. In this Guardian opinion piece, our colleagues Ray Pierrehumbert and Michael Mann argue that geoengineering is like taking aspirin for cancer. It has long been known that geoengineering is not a... See more

According to a recent study by a team of German scientists, to remove a billion tons of CO2 through “enhanced weathering,” approximately three billion tons of basalt would have to be mined, crushed, and transported. “While this is a very large amount” of rock to mine, grind, and ship, the authors noted, it is…

Some highlights have been hidden or

... See more