Over the past century people burning fossil fuels 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,although deforestation,industrial process,and some agricultural practices also emit gases into the atmosphere.
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 buildup of greenhouse gases can change earth's climate and result in dangerous effects to human health and welfare and to ecosystems.
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