Global warming define as average increase in temperature or increase in carbon dioxide in earth.there are many reasons for global warming.one is that there is gradual cutting of trees from earth that is a big loss and dangerous for human being because trees absorb carbon dioxide in greater amount this will increases global warming.second reason is that factories releases harmful gases and that causes green house effect and increases green house gases.third reason is that we use fuel which also releases carbon dioxide and other harmful gases.

Global warming produces harmful effect like glaciers mountains which contain glaciers which become melt with increase in temperature that causes flood in rivers and sea .glaciers is a big source of water for agriculture.

Global warming also effect on ecosystem and also causes various diseases like malaria etc with increase in temperature.

Global warming increases the duration of summers and in summer there is to much hotness and decreases the duration of winters and to much coldness in winter.

We should planted more plants and do not cut the trees which absorb carbon dioxide and play important role to avoid from flood.and use coal as a fuel which avoid us from harmful gases and in this way we keep environment clean and good for living