Six cutting-edge technologies that could reverse global warming: From dumping WHALE POOP in the sea to engineering CLOUDS to block out sun

Around the world, ambitious projects are testing everything from seeding clouds with chemicals to pouring artificial whale excrement into the sea. The goal is to remove CO2 from the atmosphere via so called'geoengineering' and'carbon capture' processes - and help to mitigate climate change. Geoengineering sees heat from the sun reflected back into space to limit climate change, while'carbon capture' captures CO2 from the air, either directly or by capturing it in rain among other techniques. The White House cautiously supported further research into an idea straight out of science fiction - 'blocking the sun' to cool the atmosphere - in a report last year. The federally mandated report said that there is'a compelling case for research to better understand both the potential benefits and risks'.