Why are carbon dioxide levels rising—and why does it matter for people and the planet?
Ask CO₂ Clock
Explore our curated stories and analyses on Earth’s changing atmosphere, climate data, and sustainable solutions.
Atmospheric CO₂ Trends
Climate Data Analysis
How do scientists know the climate is changing? See how global data tells the story.
Earth System Science
Learn how land, water, air, and life are all connected in the Earth's climate system.
Climate Solutions
Explore real, proven ways to reduce emissions and protect our planet for the future.