What is global warming?

Carbon dioxide released in the atmosphere creates a green house effect by trapping the heat radiated from the earth. It is therefore called greenhouse gas and without it the earth would have been too cold to live in.
However, when its level in the atmosphere increase due to factory smoke or car fumes, the heat retained increases the temperature of the earth. This is called global warming. This rise in temperature causes the snow in coldest parts of the world to melt. As a result the sea level rises, causing floods in the coastal areas.
There may be drastic changes in the climate of a place leading to extinction of some plants and animals in the long run

PLEASE SAVE THE EARTH