NASA Climate on Twitter: "Carbon dioxide is giving Earth a jolt! Did you know there's about 400 parts per million (ppm) of caffeine in coffee? There's over 400 ppm of CO₂ in
![Observed concentrations of CO2 cross 400 parts per million threshold at several Global Atmosphere Watch stations | World Meteorological Organization Observed concentrations of CO2 cross 400 parts per million threshold at several Global Atmosphere Watch stations | World Meteorological Organization](https://ane4bf-datap1.s3-eu-west-1.amazonaws.com/wmocms/s3fs-public/styles/featured_media_detail/public/news/featured_media/clip_image002_062.jpg?x9M_K_y8B3yDFqlMLCKcsO2gXfBFRr6k&itok=sYvLQTBt)
Observed concentrations of CO2 cross 400 parts per million threshold at several Global Atmosphere Watch stations | World Meteorological Organization
![Starting Later This Year, 400 and Up is Likely to Be the New Normal for CO2 Measurements - The New York Times Starting Later This Year, 400 and Up is Likely to Be the New Normal for CO2 Measurements - The New York Times](https://static01.nyt.com/images/2015/10/22/blogs/dotkelling400/dotkelling400-blog480.png)