Patrick Michaels, director of the Cato Institute's Center for the Study of Science, said summit attendees truly concerned with climate change should follow the example of the U.S., which has reduced its carbon-dioxide emissions more than any other nation in the past decade.
"How did we reduce our emissions so much more than anyone else? Because we had capital to invest and hydraulic fracturing of natural gas," Mr. Michaels said. "We did it because our economy is free and vibrant. Unfortunately, it will be the tendency of the U.N. participants to try and impose command-and-control-type regulations."