We acknowledge that there is considerable public skepticism in this country surrounding the scientific evidence that human actions are leading toward unprecedented warming of the planet.

However, to do nothing until the facts are inescapable to even the most avowed critic would be reckless. Donald Brown, associate professor of Environmental Ethics, Science and the Law at Penn State, has written that "the nature of the risk from climate change is enormous and using scientific uncertainty as an excuse for doing nothing is ethically intolerable."

So we need to act. The U.S. Senate is expected to debate legislation following the Memorial Day recess that would cap emissions of greenhouse gases and create a trading system of emission credits that would allow in dividual busi nesses to determine the least ex pensive and best ways to achieve the reductions.

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