There are essentially three source that could be responsible for the global warming that scientists see: The sun, the earth's reflectivity, and greenhouse gases.
Scientists have looked carefully at each of these factors. The only one where the data matches up is greenhouse gases -- levels of these gases have risen sharply as we burn more fossil fuels.
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Climate: Facts, dangers and what you can do | Environmental Defense Fund - 0 views
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This area of the article states main causes of global warming. The sun, the Earth's reflective, and the greenhouse gases.
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