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Global warming slowing: What does that mean?

Global warming is slowing but greenhouse gases keep rising. What's happening? Scientists say the global warming lull is likely due to heat going deep into the ocean and natural climate fluctuations.

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Halldor Thorgeirsson, right, a senior director with the United Nations Framework Convention on Climate Change, and researcher Brian Hoskins take questions at London's Imperial College on Tuesday, Sept. 17, 2013. Thorgeirsson said international leaders are failing to fight global warming, appealing directly to the world's voters to pressure their politicians into taking tougher action against the buildup of greenhouse gases.

(AP Photo/Raphael Satter)

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Scientists working on 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 though greenhouse gas emissions keep rising.

Leaked documents obtained by The Associated Press show there are deep concerns among governments over how to address the issue ahead of next week's meeting of the Intergovernmental Panel on Climate Change.

Climate skeptics have used the lull in surface warming since 1998 to cast doubt on the scientific consensus that humans are cooking the planet by burning fossil fuels and cutting down CO2-absorbing forests.

The IPCC report is expected to affirm the human link with greater certainty than ever, but the panel is under pressure to also address the recent lower rate of warming, which scientists say is likely due to heat going deep into the ocean and natural climate fluctuations.

"I think to not address it would be a problem because then you basically have the denialists saying, 'Look the IPCC is silent on this issue,'" said Alden Meyer, of the Washington-based Union of Concerned Scientists.

In a leaked June draft of the report's summary from policy-makers, the IPCC said the rate of warming in 1998-2012 was about half the average rate since 1951. It cited natural variability in the climate system, as well as cooling effects from volcanic eruptions and a downward phase in solar activity.

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