Hooboy, it's gonna get hot. A U.N. climate panel on Sunday painted a sizzling picture of the staggering volume of greenhouse gases we've been pumping into the atmosphere -- and what will happen to the planet if we keep this shit up.
By 2100, surface temperatures will be 3.7 to 4.8 degrees C (6.7 to 8.7 F) warmer than prior to the Industrial Revolution. That's far worse than the goal the international community is aiming for -- to keep warming under 2 C (3.7 F). The U.N.'s terrifying projection assumes that we keep on burning fossil fuels as if nothing mattered, like we do now, leading to carbon dioxide levels in the atmosphere of between 750 and 1,300 parts per million by 2100. A few centuries ago, CO2 levels were a lovely 280 ppm, and many scientists say we should aim to keep them at 350 ppm, but we're already above 400.
These warnings come from the third installment of the latest big report from the U.N. Intergovernmental Panel on Climate Change, compiled by hundreds of climate scientists and experts. (WTF is this IPCC? See our explainer. Feel like you've heard this story before? Perhaps you're thinking of the first installment of the report, which came out last fall, or the second installment, which came out last month. Maybe the IPCC believes that breaking its report into three parts makes it more fun, like the Hobbit movies.)
Here's a paragraph and a chart from the 33-page summary of the latest installment that help explain how we reached this precarious point in human history.