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Global Warming 20 Years Later:Tipping Points Near : 

23 June 2008 National Press Club, and House Select Committee on Energy Independence & Global Warming Washington, DC Global Warming 20 Years Later:Tipping Points Near

1988 Testimony: Conclusions : 

Earth is warmer in 1988 than at any time in the history of instrumental measurements Global warming is now large enough that we can ascribe with a high degree of confidence a cause and effect relationship to the greenhouse effect Greenhouse effect is already large enough to effect the probability of extreme events such as summer heat waves 1988 Testimony: Conclusions