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1.5°Cは警告だった——今やそれは現実の天気だ

1.5°C Was the Warning—Now It’s the Weather

2024年、世界の平均気温が1.55°Cを超え観測史上最高を記録。パリ協定の1.5°C目標が「未来の警告」から「今そこにある現実」へと変わりつつある。
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In 2015, the Paris Agreement made 1.5°C famous around the world. At that time, it sounded like a warning about the future. Now it feels much closer. According to the World Meteorological Organization, every year from 2015 to 2024 was one of the ten warmest years ever recorded. Then 2024 became the hottest year in the 175-year record, with a global average temperature about 1.55°C above the 1850–1900 level. WMO also said 2025 was likely the second or third warmest year on record, so this is not a one-year surprise but a continuing trend. A single year above 1.5°C does not mean the Paris goal has officially failed, because that goal is judged over a longer period. Still, it is a powerful sign that the planet is moving dangerously close to that limit. (unfccc.int)

Why has warming seemed to accelerate after 2015? The main reason is simple: greenhouse gases have kept rising. NOAA reports that global atmospheric carbon dioxide reached 422.8 ppm in 2024, and the annual increase has sped up, averaging 2.6 ppm per year in 2014–2024, much faster than in the 1980s or 1990s. Methane also reached a record level in 2024. Natural climate patterns matter too. The strong El Niño of 2023–2024 added extra short-term heat, but WMO and NASA both stress that greenhouse gases are still the main driver of the long-term trend. (gml.noaa.gov)

Another big change since 2015 is what is happening in the oceans. WMO says ocean heat content hit a new record in 2024, and the rate of ocean warming in 2005–2024 was more than twice the rate seen in 1960–2005. Sea level is also rising faster: 4.7 millimeters per year in 2015–2024, more than double the 1993–2002 rate. That means the effects of warming are no longer abstract. They are being stored in the ocean and pushed onto coasts around the world. (public.wmo.int)

Perhaps the most troubling fact is that the world promised action in 2015, but emissions are still extremely high. UNEP says global greenhouse gas emissions reached a record 57.1 GtCO2e in 2023, and current policies still point to about 3.1°C of warming this century. So what changed after 2015? The science did not suddenly change. Our situation did. What once looked like a distant problem has become a present-day reality. (unep.org)

by EigoBoxAI
作成:2026/03/28 03:01
レベル:中上級 (語彙目安:4000〜6000語)

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