Guardian: Global warming is caused by a whole host of gases and particles. In addition to the chief villain – carbon dioxide from fossil fuel use – two of the most important are methane and nitrous oxide, both of which are generated in large quantities by agriculture and fossil fuel extraction, among other sources. Then there are all the refrigerant gases used in the world’s air conditioners, fridges and freezers; the soot generated by cars, industrial plants and cooking fires the world over; and even the…

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