"An important lesson learned is that air pollution damage imposes major economic costs, through premature mortality, increased sickness and lost productivity, as well as decreased crop yields and ecosystem impacts," the report says. "Cost-benefit analyses in the U.S. show that emission reduction programs have provided much greater benefits than their costs, by a ratio of up to 40 to 1, according to some estimates."
When they are enforced, they can be effective.
posted by Atreides at 8:16 AM on September 7, 2007