Greenhouse+gases2

= Greenhouse Gases:  = = are contributing to the Earth's greenhouse effect. Water vapor, the gaseous state of water, is the most abundant greenhouse gas, followed by carbon dioxide and other trace gases. Human acativites are causing an increase in these gases that my lead to changes in global climate. = = Facts. =

CAR TRAVEL
=== Burning a gallon of gasoline emits almost 20 pounds of carbon dioxide. A typical late-model, mid-sized sedan produces about 9,500 pounds of carbon dioxide each year, while a hybrid car generates less than half that, about 4,300 ===

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