National Public Radio: About David Keith's TEDTalk Environmental scientist proposes a cheap and shocking way to address climate change: What if we inject a huge cloud of sulfur into the atmosphere to deflect sunlight and heat? About David Keith Environmental scientist David Keith works at the intersection of climate science, energy, and public policy. His research has taken him into some the realms of geo-engineering including a dramatic potential solution to climate change, such as blowing a cloud of sulfur into...