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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.
Independently, oxygen and nitrogen are not greenhouse gases (though N2O, NO and NO2 are greenhouse gases). The most important greenhouse gas is carbon dioxide. Methane, althou â¦ gh found in quite low concentrations is also important because of its proportionately greater effect.here are several gases that are classed as greenhouse gases.    They are:   water vapor  carbon dioxide  ozone  methane  nitrous oxide  CFCs     Energy â¦ from the sun heats the earth's surface and atmosphere, which  drives the earth's weather and climate.