User talk:Saitwal

Global warming

It means the heat that is absorbed by the earth's lower surface from the sun's rays.The main greenhouse gases are: water vapor, carbon-do-oxide, ozone, methane. These gases do not allow all the radiations of the sun to escape from the atmosphere of the earth.This is known as the greenhouse effect.These trapped radiations give heat and warmth to the earth.Over the past few years man has been cutting trees,which results in releasing millions of tons of carbon-di-oxide. Water is also very good in absorbing heat.This causes the earth to become more warmer.Scientists have called this effect"Global Warming".