It is time to stop waffling so much and say that the evidence is pretty strong that the greenhouse effect is here. Hansen, Greenhouse Researcher, Goddard Institute for Space Studies Transportation is a source of carbon dioxide emissions. Human activities are intensifying the natural greenhouse effect. Every year we release billions of tons of heat-trapping gases to the atmosphere. In doing so, we are setting the stage for a warmer Earth.
Industry is a major source of heat-trapping gases.
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