| http://www.w3.org/ns/prov#value | - The debate shifted to why global warming is happening.The second tipping point came on February 2, 2007, when the U.N.'s Intergovernmental Panel on Climate Change released a report declaring that with near certainty ??? more than 90 percent confidence ??? that carbon dioxide and other greenhouse gases from human activities have been the main causes of warming in the past half century.
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