"I'm not saying the challenge isn't almost overwhelming," says Fred Krupp.

“我并不是说这个挑战不是压倒性的。”弗雷德·克虏伯说。

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"It's a mistake to rush headlong into this, " said Fred Krupp, president of the Environmental Defense Fund.

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As president of the Environmental Defense Fund, Fred Krupp helped establish a market-based cap-and-trade system to limit acid rain pollution in the late 1980s.

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They include such domestic energy enthusiasts as former Al Gore aide and secretary of the Pennsylvania Department of Environmental Protection Kathleen McGinty, and Fred Krupp, president of the Environmental Defense Fund.

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