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More than 99% of climate scientists

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attribute the increase in global temperature

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over the past 30-40 years

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to greenhouse gases

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that humans have been adding to the atmosphere

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since the beginning of

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the Industrial Revolution in the 1700s.

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The great majority of these scientists agree

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that if this warming continues,

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it presents significant risks to humankind

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and all life on Earth:

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to our cities and towns,

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our water and food supplies,

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and our health.

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How do we know that this warming is happening

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and that it’s caused by humans?

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How strong is the evidence?

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What risks can we expect and

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what we can do about them?