FILE - 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. (AP Photo/John McConnico, File)