Heat waves and floods shattered records. Fires ravaged the Arctic and the Amazon. This was the climate crisis in 2019.

Morgan McFall-Johnsen
,Business Insider•November 22, 2019

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Scientists say climate change likely played a role in the severe polar vortex event that engulfed North America, the deadly summer heat waves in Europe, and the devastatingly slow movement of Hurricane Dorian.

Taken together, the record-shattering extreme weather we saw throughout 2019 paints a worrisome picture of what's to come.

Atmospheric carbon dioxide has reached its highest level in at least 800,000 years.

As of October, the atmospheric concentration of carbon dioxide was at 412 parts per million.

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