| By The Huffington Post on George W. Bush During a speech today, President Bush said "First of all, the globe is warming. The fundamental debate -- is it manmade or natural?" Actually, that's no longer a debate, at least among the overwhelming majority of scientists. The Guardian reports: Natural variation in the Earth's climate, or changes in solar activity or volcanic eruptions, which have been suggested as alternative explanations for rising temperatures, could not explain the data collected in the real world. Models based on man-made emissions of greenhouse gases matched the observations almost precisely. "What absolutely nailed it was the greenhouse model," Dr [Tim] Barnett [of the Scripps Institution of Oceanography in La Jolla, California] told the American Association for the Advancement of Science conference in Washington. Two models, one designed in Britain and one here in the US, got it almost exactly. We were stunned." ...Only the greenhouse models replicated the changes that have been observed in practice. "All the potential culprits have been ruled out except one," Dr Barnett said.  |
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