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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.
A greenhouse gas (GHG) is any gas in the atmosphere that takes in (absorbs) and gives off (emits) radiation in the heat (infrared) wavelength range. Greenhouse gases cause the greenhouse effect, which results in increased temperatures on Earth.ut greenhouse gases in the atmosphere absorb some of the infrared radiation energy and âtrapâ it in the lower atmosphere. Less heat radiates into space, and the Earth is warmer. Many greenhouse gases occur naturally. Carbon dioxide, methane, water vapor, and nitrous oxide are naturally present in Earthâs atmosphere.