1. Global Warming
... gov/oar/globalwarming): Why though are these natural gases that provide the Earth with life now suddenly growing in number, especially over the past two decades? Scientists have found that human beings are the primary producer of these green house gases. In the past pre- industrial revolution, " Plant respiration and the decomposition of organic matter release more than 10 times the CO2 released ... by human activities; but these releases have generally been in balance during the centuries leading up to the industrial revolution with carbon dioxide absorbed by terrestrial vegetation and ...
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