Scientific American: Think of a holiday road trip's effect on the climate this way: The amount of heat a car contributes to the atmosphere because of its carbon emissions may be 100,000 times greater than the actual heat given off by its engine.
That's the conclusion of a Carnegie Institution for Science study published Tuesday that shows two things: Emissions from burning a lump of coal or a gallon of gas has an effect on the climate 100,000 times greater than the heat given off by burning the fossil fuel itself....