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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Brumar89 who wrote (895496)	10/21/2015 10:12:05 PM
From: Wharf Rat	Read Replies (1) \| Respond to of 1573709

" how could Exxon researchers have known years before what the IPCC said it didn't know as late as 1990?" As late as 1990, there was no IPCC report. The IPCC first assessment report was completed in 1990, and served as the basis of the UNFCCC. The executive summary of the WG I Summary for Policymakers report says they are certain that emissions resulting from human activities are substantially increasing the atmospheric concentrations of the greenhouse gases, resulting on average in an additional warming of the Earth's surface. They calculate with confidence that CO2 has been responsible for over half the enhanced greenhouse effect. They predict that under a "business as usual" (BAU) scenario, global mean temperature will increase by about 0.3 °C per decade during the [21st] century. They judge that global mean surface air temperature has increased by 0.3 to 0.6 °C over the last 100 years, broadly consistent with prediction of climate models, but also of the same magnitude as natural climate variability. The unequivocal detection of the enhanced greenhouse effect is not likely for a decade or more. en.wikipedia.org