Special Report

27 Effects of Climate Change That Can't Be Stopped

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1. Carbon dioxide levels above 400 ppm

The concentration of global atmospheric carbon dioxide now exceeds 400 parts per million (ppm), a level that hasn’t been seen in about 3 million years.

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2. Global warming so far: 1.0°C

Over the past 115 years, roughly since the period of human industrial production, surface temperatures have increased by approximately 1.0°C, or 1.8°F. Even such a small increase has had drastic effects.

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3. Record heat

Since the year 2000, nearly every year has been one of the hottest on record. The five warmest years on record have all occurred since 2010.

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4. Hotter in the US

In the United States, the number of record daily high temperatures has been roughly double the count of record daily low temperatures in the 2000s.

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5. Hotter days ahead

In most parts of the U.S., annual minimum and maximum temperatures are expected to rise by at least 5°F by mid-century, and by as much as 10°F by 2100.