Climate: Facts, dangers and what you can do

The Earth is heating up

Scientists track changes to the planet's temperature in many ways. Land-based weather stations and ocean buoys in every corner of the world monitor temperatures constantly.

Temperatures from the past left their traces in tree rings, coral reef and ice cores. When scientists look at all this evidence, they have a very clear picture of how the earth's temperature is changing.

Breaking the silence

We need to make changes now

People around the world are addressing global warming. For example, California enacted a bold law to cut global warming pollution, and when out-of-state polluters attacked it, voters supported it.