NCDC: Global Warming - 1 views
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There is no scientific debate on this point. Pre-industrial levels of carbon dioxide (prior to the start of the Industrial Revolution) were about 280 parts per million by volume (ppmv), and current levels are about 370 ppmv.
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Without a natural greenhouse effect, the temperature of the Earth would be about zero degrees >
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Without a natural greenhouse effect, the temperature of the Earth would be about zero degrees F
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