Ben van der Pluijm and Stanford/Carnegie's Ken Caldeira hosted a Reddit AMA on climate engineering, responding to 270+ questions from the public: This r/science AMA was organized by the American Geophysical Union in response to a new set of papers on the highly controversial topic of climate engineering in the journal Earth's Future, and a related editorial by Ben van der Pluijm (Good Night Sunshine: Geoengineering Solutions to Climate Change?;