Overall, Earth is getting hotter.
The warming comes directly from human activities – specifically, the release of greenhouse gases like carbon dioxide from burning fossil fuels. We started burning fossil fuels in earnest during the Industrial Revolution. Activities like driving cars and operating factories continue to release greenhouse gases into our atmosphere, where they trap heat in the atmosphere.
At the End of the Day, It’s Us
Our satellites, airborne missions, and measurements from the ground give us a comprehensive picture of what’s happening on Earth every day. We also have computer models that can skillfully recreate Earth’s climate.
By combining the two, we can see what would happen to global temperature if all the changes were caused by natural forces, like volcanic eruptions or ENSO. By looking at the fingerprints each of these climate drivers leave in our models, it’s perfectly clear: The current global warming we’re experiencing is caused by humans.
For more information about climate change, visit climate.nasa.gov.