Since the dawn of the industrial age, humans have been pumping increasing amounts of carbon dioxide into the atmosphere by burning coal, oil and gas. Researchers at the Mauna Loa Observatory, perched on the side of a volcano on Hawaii’s Big Island, have measured atmospheric levels of this greenhouse gas since 1958. That first year, carbon dioxide averaged 316 parts per million. In May, it reached 410 p.p.m. — an amount never before experienced in the history of our species. This atmospheric carbon dioxide — as well as other heat-trapping gases and other air pollutants emitted by humans — is affecting our planet profoundly.… Seguir leyendo »
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