SciDevNet: The 'plan B' of using geoengineering to rescue humanity from the impact of climate change exists in a 'vacuum' of international regulations, according to a recent review. Proposals to counteract the effects of global warming by engineering the planet, with methods such as spraying chemicals into the atmosphere to block solar radiation, are largely theoretical and lacking in research. But they prompt debate, with some scientists rejecting particular geoengineering proposals altogether, and others...