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.
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.
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.
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.
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.