NASA scientists can observe greenhouse gases from space, and they say soot, mostly from diesel engines, is causing as much as 25% of all global warming, by reducing the ability of snow and ice to reflect sunlight. “We suggest that soot contributes to near worldwide melting of ice that is usually attributed solely to global warming,” say NASA’s James Hansen and Larissa Nazarenko.
They say soot has twice the effect on global warming as carbon dioxide. This is actually not bad news, because while it will take money, replacing diesel engines is a possibility, while doing without fossil fuels is not?at least not for the near future. Besides diesel engines, other sources of soot come from the burning of wood, animal dung, and vegetable oil.