Line graph time series of March monthly mean carbon dioxide abundance from 1958 through March 2026. There is a long-term increasing trend and seasonal cycle. Current Earth Day 2026 levels are around 431 ppm for this week in April. And the first Earth Day in 1970 was around 328 ppm.
Happy #EarthDay! πππ
Here's an updated graph of how much carbon dioxide (COβ) has changed since the first Earth Day, which is driving recent climate change.