This is according to the United States Institute of Peace, via Think Progress.

According to statistics provided in a new report from the United States Institute of Peace, the use of air power in Afghanistan by U.S. and NATO allies has increased from 5,000 pounds of munitions per month in 2005 to 168,000 pounds in December, 2007. The result is that “civilian casualties increased by 62 [percent] in 2008, compared to figures from the first six months of 2007.” The report says the increase in air power is a result of a shortage of troops and suggests that the resulting increase in casualties is “a key reason for the Taliban comeback”:

This is what happens when you take the eye off the ball, apparently.