This past weekend concerts took place around the world to focus attention on the problem of global warming, which former U.S. Vice President Al Gore says is the greatest single threat facing humankind today. Most of the world’s scientists agree that it is a problem and that it is largely caused by human use of fossil fuels, which produce so-called greenhouse gases that trap the Earth’s heat. Al Gore and scientists who wrote the United Nations report on climate change say the debate is over and the time has come to act. But some prominent climate scientists are objecting to that, claiming that the debate has yet to even begin. VOA’s Greg Flakus recently spoke to one of them and filed this report from Fort Collins, Colorado.
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