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The natural greenhouse effect has been keeping the earth warm for millions of years, allowing life to thrive on this planet. The enhanced or accelerated greenhouse effect, which is what is happening now, is causing global warming and may mean the end of life on earth if we can't slow or stop it.o this  natural greenhouse effect is very useful.    The gases that keep the earth warm are called greenhouse  gases. The most important gas, causing about 75% of the  natural greenhouse effect, is water vapor.
We emit carbon dioxide to the atmosphere in enormous quantities because we burn so much fossil fuel and the changes in land use that we have implement are so widespread. This is why carbon dioxide is the most important gas in the man-made component of the greenhouse effect. What evidence is there that the Earthâs climate is changing? Some of the observations that indicate that the Earthâs climate is changing recorded by the Intergovernmental Panel on Climate Change are: