What Is Climate Change?

Evidence

How Do We Know Climate Change Is Real?

There is unequivocal evidence that Earth is warming at an unprecedented rate. Human activity is the principal cause.
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Causes

Why Is Climate Change Happening?

Human activities are driving the global warming trend observed since the mid-20th century.
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Effects

What Are the Effects of Climate Change?

The effects of human-caused global warming are happening now, are irreversible on the timescale of people alive today, and will worsen in the decades to come.
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Solutions

What Is Being Done to Solve Climate Change?

NASA provides the robust scientific data needed to understand climate change.
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From space, sky, sea, and land, NASA provides detailed climate data and research to the world.
Columbia Glacier melt, Alaska: 7/28/1986 - 7/2/2014