Climate change means the changes in climate...In fact, climate on earth is constantly changing. Various factors are responsible for climate change. These are man-made and natural. The natural causes are variations in solar radiation, orbital variations, ocean variability, volcanising etc. Human activities are also greatly responsible for climate change. For habitation and agricultural purpose, we r cutting down trees and destroying forests. This affects the climate adversely. Besides, use of CFCs and various other chemicals in industries causes serious harm to thr ozone layer in the atmosphere. As a result, there is a rapid increase in earth's average temperature causing greenhouse effect. Climate change has serious impact on the life and existence of plants, animals and humans on earth. Because of climate change the glaciers are melting and the sea-level is rising. A huge amount of land area on earth is under the threat of being inundated by sea water.