It's hard to overlook something that weighs 37 billion tons—especially when it's all around us. Thirty-seven billion tons is the amount of fossil-fuel-related carbon dioxide that humans release into the atmosphere each year. We see the damage it causes everywhere—from heat waves to floods to droughts to wildfires and more. But CO2 itself? Completely invisible. Until now. In a remarkable new video, NASA has made visible the production—and in some cases, the absorption—of human-produced carbon dioxide for the entire year of 2021. During that period, CO2 in the atmosphere increased by 2.13 parts per million. . (PPM), marking the eleventh consecutive year in which the increase has exceeded 2 PPM. The most dramatic conclusion of the video is the large role that the Northern Hemisphere plays in the global spread of greenhouse gases compared to the much less culpable South. (JEFFREY KLUGER, TIME)