Over the past century,
human activities have released large amounts of carbon dioxide and
other greenhouse gases into the atmosphere. The majority of greenhouse
gases come from burning fossil fuels to produce energy.
Greenhouse gases act like a blanket
around Earth, trapping energy in the atmosphere and causing it to warm.
This phenomenon is called the greenhouse effect and is natural and
necessary to support life on Earth. However, the build up of greenhouse
gases can change Earth's climate and result in dangerous effects to
human health and welfare and to ecosystems.
The choices we make today will affect
the amount of greenhouse gases we put in the atmosphere in the near
future and for years to come.
For more information, refer to http://www.epa.gov/climatechange/basics/
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