Also known as green house effect. Sunlight enters earth’s atmosphere and after hitting the earth, gets radiated back into the atmosphere and is absorbed by certain gases. This heats the atmosphere and warms the earth’s surface. In normal process this is essential for life on earth, but today there is an increase in the greenhouse gases due to a no. of factors(such as deforestation, chemical and nuclear wastes etc- see elsewhere)This increase in atmospheric concentration of greenhouse gases has serious implications on surface warming and climatic change
