10 Facts

97 percent: The percentage of scientists who agree that warming trends over the past century are very likely caused by human activity.

1950: Year when atmospheric CO2 levels broke records from the previous 400,000 years, sharply rising and continuing to grow.

8 inches: Rise in global sea levels over the last century. The rate of rise has nearly doubled in the last two decades.

16: Number of record-breaking hottest years since 2000. 2016 was the hottest year yet.

1.5 degrees: The average worldwide temperature increase in Fahrenheit compared to a century ago.

400 parts per million: Average concentration since 2016 of CO2 in the atmosphere, compared to 275 PPM for past 400,000 years.

9: The 9 most explosive fires in America's history have all occurred since 2000, with 2015 having the biggest fire (10.1 million acres burned) in American history.

19th century: When the heat-trapping nature of CO2 was first demonstrated.

30 percent: The increase in acidity of the world's oceans.

$180 billion: Estimated economic losses to the United States by end of the century if no action is taken on climate change.