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マウナロア観測所で4月に計測された大気中の二酸化炭素濃度は約431ppmになり、過去最高を更新した。これは1958年に測定が始まった当初の320ppmから大きく上昇している。このニュースは科学誌『Scientific American』によって伝えられ、Climate Centralの気候科学者Zachary Labe氏は「残念だが予想内」と述べている。
Labe氏によると、植物が冬に枯れ落ちて温室効果ガスを放出する4月ごろに二酸化炭素濃度が高いことは年々繰り返されている。一方で、北米大気中の二酸化炭素の平均月間量は上昇傾向にあるという警告がある。
2023年と2024年にアメリカの排出量が減少したものの、2025年の排出量は増加し、これは人工知能データセンターからの電力需要が増えたことによる可能性がある。Labe氏は、太陽や風力などの再生可能エネルギーの使用拡大により希望を感じているという。
この記事では、CO2濃度の上昇が気候変動への警戒を強めつつ、同時に再生可能エネルギーや排出量削減の取り組みの必要性も指摘している。
Atmospheric carbon dioxide hit a new record in April, averaging about 431 parts per million at NOAA's Mauna Loa Observatory. That's up from under 320 ppm when the site began measurements in 1958. Scientific American reports: Greenhouse gases, such as carbon dioxide, are measured as a proportion of the total atmosphere. The numbers are presented as the number of molecules of a particular gas out of a million total molecules, or ppm. Climate scientist Zachary Labe of Climate Central, a nonprofit that researches climate change, says the new record is "depressing" but not unexpected. "It's just another sign that carbon dioxide continues to increase in our atmosphere as our planet continues to warm," he says. "For many climate scientists, this is just 'here it is again, another record in the wrong direction.'"
Labe explains that the amount of CO2 in the atmosphere tends to peak in April each year as decaying plants release greenhouse gases after winter. Some of that CO2 gets reabsorbed by plants as they grow during the warmer months. But NOAA's data show a worrying trend, with the average monthly amount of CO2 steadily increasing. [...] Although the amount of CO2 in the atmosphere has continued to rise, there was a reduction in U.S. emissions in 2023 and 2024. That trend, however, was reversed in 2025, at least partially because of the increased electricity demand from artificial intelligence data centers. Still, Labe says there are reasons for optimism as the use of renewable energy sources such as solar and wind expands.
Read more of this story at Slashdot.
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