"The climate is always in change," he said. "Glaciers are always advancing or re­treating.

"Think of it this way, would you rather the glaciers be advancing?"

Energy use, specifically carbon-based fuels such as coal, is responsible for some temperature increases, Christy said. But the societal benefits of energy far out­weigh the pollution, he added.

Life expectancy has soared over the last 100 years, he said, largely because of more efficient energy uses. That makes so­lutions that call for an end to carbon-based fuels unrealistic.

"There is no substitute for the carbon fuels we have now," said Christy.

Wind and solar power work on a limited scale, he said, but they impact the environment as well.

Christy said those who claim global warming spells doom for society fall into three categories.

True believers, he said, claim that any impact humans have on Earth is negative. Others are looking to make a profit. The third group just has a bleak feeling about the environment and wants to do some­thing.

The last group can be a positive force, he said, if they make changes based on what he called sound science.

"Everyone should look at their energy uses and find ways to save money," he said. "If you are saving money, you are probably saving energy."

The government can help by encourag­ing new fuels.

"Making energy more expensive is a regressive tax," he said.  Source

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