| http://www.w3.org/ns/prov#value | - on on climate change.1988NASA climatologist James Hansen testifies before the U.S. congress, saying that the Earth was warmer in the first five months of that year than any year since recording began, and that he is ???99 percent certain??? that the trend is the result of a build up of carbon dioxide and other artificial gases in the atmosphere.1990The IPCC issues its First Assessment Report, whic
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