Independent: Governments could slow global warming dramatically, and buy time to avert disastrous climate change, by slashing emissions of one of humanity’s most familiar pollutants — soot — according to Nasa scientists. A study by the space agency shows that cutting down on the pollutant, which has so far been largely ignored by climate scientists, can have an immediate cooling effect — and prevent hundreds of thousands of deaths from air pollution at the same time. At the beginning of the …