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Oct 28, 2016, 3:00 pm143 pts
Mongabay
Over the past million years of Earth’s history, the level of atmospheric carbon dioxide has been generally low, fluctuating within a range of 200 to 300 parts-per-million (ppm). But this trend was abruptly interrupted by the rise of industrialization over the past 100 years, which led to the current level of…
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