| http://www.w3.org/ns/prov#value | - Global warming is caused by the burning of fossil fuels - coal, oil and natural gas - which sends heat-trapping gases, such as carbon dioxide, into the air, changing the climate, scientists say.what is happening with temperatures in the United States is consistent with the long-term pattern of 'big heat events that reach into new levels of intensity,' Arndt said.Last year was 3.2 degrees warmer tha
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