Climate Change Keeps Looking Worse and Worse

More bad news on climate change, I’m afraid. A team of scientists has completed a highly accurate assessment of ocean temperature increases based on measurements of atmospheric oxygen and carbon dioxide. The hotter the ocean gets, the more of these gases you expect to find, so these measurements act as a “whole-ocean thermometer.” Here are the results in a nutshell:

APO stands for “atmospheric partial oxygen,” and the chart shows the portion of ΔAPO that’s caused by climate change. This can then be reverse engineered to tell us how much ocean warming is caused by climate change.

Other studies have recently produced estimates of ocean warming that are higher than we previously thought, and this one provides confirmation using entirely different methods. Needless to say, this is bad news: if ocean temperature is rising faster than we thought, it means that sea level is also rising faster than we thought. This is potentially disastrous for low-lying regions like Florida, Bangladesh, and islands in the western Pacific.

But that’s not all. One of the key questions in climate change science is “sensitivity”: that is, how much temperature will rise based on a doubling of atmospheric CO2. This new estimate increases the lower bound from 1.5ºC to 2ºC, which in turn reduces the amount of CO2 we can emit and still keep global warming below the target range of 2ºC above historical levels.

The odds of staying below that 2ºC target were always slim. Now they’re slimmer still unless we get serious about climate change mighty fast. So far, there’s not much sign of that happening.


In 2014, before Donald Trump announced his run for president, we knew we had to do something different to address the fundamental challenge facing journalism: how hard-hitting reporting that can hold the powerful accountable can survive as the bottom falls out of the news business.

Being a nonprofit, we started planning The Moment for Mother Jones, a special campaign to raise $25 million for key investments to make Mother Jones the strongest watchdog it can be. Five years later, readers have stepped up and contributed an astonishing $23 million in gifts and future pledges. This is an incredible statement from the Mother Jones community in the face of huge threats—both economic and political—against the free press.

Read more about The Moment and see what we've been able to accomplish thanks to readers' incredible generosity so far, and please join them today. Your gift will be matched dollar for dollar, up to $500,000 total, during this critical moment for journalism.

We Recommend


Sign up for our newsletters

Subscribe and we'll send Mother Jones straight to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.


Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.


We have a new comment system! We are now using Coral, from Vox Media, for comments on all new articles. We'd love your feedback.