The world has become one country. It means, even if something happens in one country, that’s not a problem which pertains to only one country, also it’s a problem which all the nations in the world should be concerned about it. These day not only most scientists or ecologists, but also most of the people pay attention to changes of our climate. The temperature of the surface on the earth is going up. As a result of high temperature it causes many serious problems in our environment. This phenomenon is called ‘Global Warming’. Briefly, it refers to the warming in recent decades and its projected continuation, and implies a human influence.
Why have it become an urgent environmental problem nowadays? Many scientists have warned very seriously that if we don’t make any effort to prevent global warming, in the near future lots of continents which still exist as a land will become immersed by the melting of the glaciers