Climate Milestone: Earth's CO2 Level Nears 400 ppm

Climate Milestone: Earth's CO2 Level Nears 400 ppm

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日期:2026-04-21
An instrument near the summit of Mauna Loa in Hawaii has recorded a long-awaited climate milestone: the amount of carbon dioxide in the atmosphere there has exceeded 400 parts per million (ppm) for the first time in 55 years of measurement—and probably mo...看更多