Global Warming

The planet has warmed around 2 degrees Fahrenheit since the late 1800s (and is tied for the
hottest year on record), when the spread of industrialization led to rising emissions of
greenhouse gasses. Since 1980, warming has averaged about 0.32 degrees Fahrenheit per
 decade.

According to climate scientists, the world is seeing an increase in heat waves, storms and other
 extreme weather as the planet warms, and in disasters like droughts, floods and wildfires that
result. Last year offered no respite, with record fires in Australia and California, and severe
drought in central South America and the American Southwest.

Some forecasters had thought that the arrival of cooler sea-surface temperatures in the Pacific
 Ocean — part of the recurring global climate phenomenon called La Niña — would lower
temperatures this year. Clearly La Nina was overshadowed by the rise in temperatures
 throughout the year.

La Niña only emerged in September, and is expected to continue at least through winter. The climate impact of La Niña tends to peak several months after the Pacific waters reach their coolest point, so it may have more of a cooling effect in 2021.

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