The recession is contributing to higher levels of air pollution in the Washington area as new car sales plummet and older, dirtier vehicles remain on the road longer, according to a recent study by regional planners.
Climate Change Conference
More on the Dec. 3-14, 2007 event in Bali, Indonesia.
Visual representations of the effects of climate change.
Warm Trends The "hockey stick graph," so called because its line resembles one, used data and estimates from thermometers, tree rings, corals, ice cores and historical records to chart temperatures over 1,000 years.
A Rapid March Global warming is a factor in the spread of diseases carried by insects and water, scientists say.
Twelve states, led by Massachusetts and joined by the District of Columbia, are objecting to the Environmental Protection Agency's decision to decline to issue emissions standards for new cars and trucks.