The only way to know how any so-called geoengineering techniques would affect the climate is to deploy them over several decades on a massive scale, writes Silvia Ribeiro

Pumping a sun-reflective aerosol into the atmosphere could help slow global warming, so       David Keith and Gernot Wagner say the US should begin to research albedo modification

Yet one more movie hero drawn - in this case like painful and rotting teeth - from the pages of a Marvel comic.