Soot reduction may help slow global warming

摘要

A recent study by the US space agency NASA shows that cutting emissions of soot can have an immediate cooling effect-and prevent hundreds of thousands of deaths from air pollution at the same time.Emission reductions have a virtually instantaneous effect,because soot rapidly falls out of the atmosphere,unlike carbon dioxide,which remains there for over a hundred years.And because soot is one of the worst killers of all pollutants,radical reductions save lives and so should command popular and political support.