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Even so, the Chicago Climate Exchange will be ahead of U.S. law, and will be a test of corporations' readiness to act on their own. "This is the Wright brothers' version of an aircraft," Sandor says. "It's not the 747 that exists after 50 years, but it's a start. And that's going to be important to your children and my grandchildren." --By Katherine Ellison
Ellison is co-author of The New Economy of Nature: The Quest to Make Conservation Profitable