Month in which President Trump officially withdrew the U.S. — the world's second-biggest emitter of greenhouse gas pollution — from the Paris Agreement, a 2016 international treaty that aims to cut those emissions in order to limit global warming to levels that would stave off the most catastrophic effects: 11/2020

Rank of that month among the world's hottest Novembers on record, with 2020 as a whole also on track to break temperature records: 1

Of the five hottest years ever recorded on the planet, number that have come since 2015: 5

Months before Trump's withdrawal from the Paris Agreement that the Proceedings of the National Academy of Sciences published a study showing that climate change is causing hurricanes to intensify faster, grow stronger, move more slowly, and dump more rain: 6

Rank of October's Hurricane Delta among the most rapidly intensifying Atlantic basin hurricanes ever, and one which also broke records as the fourth named storm to hit Louisiana in a single season: 1

Estimated financial losses in the U.S. just from Hurricane Delta, which made landfall as a Category 2 storm, and the much stronger Hurricane Laura, which hit the same area of western Louisiana near the Texas border in August as a Category 4 with sustained winds of 150 miles per hour: $9.5 billion to over $16 billion

Total cost of hurricanes to the mainland U.S. in 2017, a peak year: $307 billion

Date on which President-elect Joe Biden announced that his administration would rejoin the Paris Agreement in January: 11/4/2020

Amount Biden is proposing to spend as part of his climate stimulus package, which would expand the use of clean energy: $2 trillion

Year by which Biden's plan aims to reach net-zero carbon emissions: 2050

Rank of the outcome of the two Jan. 5 Senate runoff elections in Georgia, which will decide partisan control of the body, among the primary factors determining whether the U.S. government will be able take the swift and far-reaching action needed to prevent even more catastrophic warming: 1

Month in which the Republican National Committee re-adopted its 2016 platform, which does not acknowledge that human activity is driving climate change: 6/2020

Percent of Georgians who agree with climate scientists that the planet is warming due to human activity: 54

Degrees Celsius by which the global temperature has already risen over preindustrial levels: 1

Degrees Celsius to which scientists say we need to limit the increase in order to stave off catastrophic effects: 1.5 to 2

If Biden's targets are met, temperature rise in degrees Celsius that the emissions reductions would avoid by 2100, according to an analysis by Climate Action Tracker: about 0.1

Year in which global carbon dioxide emissions began to flatten, a hopeful development tied to a drop in the use of coal and an increase in the use of renewable energy technologies: 2019

Date on which early voting in the Georgia runoffs begins: 12/14/2020

(Click on figure to go to source.)