In this Tuesday Aug, 16, 2005 file photo an iceberg melts in Kulusuk, Greenland near the arctic circle. Scientists who are fine-tuning a landmark U.N. report on climate change are struggling to explain why global warming appears to have slowed down in the past 15 years even as greenhouse gas emissions keep rising. Leaked documents show there is widespread disagreement among governments over how to address the contentious issue in Sept. 23-26 stock-taking report by the Intergovernmental Panel on Climate Change.

Climate of Doubt

October 23, 2012 / 53m

Season 2012: Episode 21

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Photo: (AP Photo/John McConnico)

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Four years ago, climate change was a hot issue and politicians from both sides seemed poised to act. Today public opinion on the climate issue has cooled considerably. Politicians either ignore it or proclaim their skepticism. What’s behind this massive reversal? FRONTLINE goes inside the organizations that fought the scientific establishment to shift the direction of the climate debate.