What is Global Warming ?

In general the world is facing a lot of problems and actually we are not going to define each problem, but we have to define the important ones such as global warming. Global warming is the increase in the earth temperature. It is caused by the released gases that makes the earth atmosphere keeps the heat which come from the sun. This heat is gradually increased during the past century. Due to the observed increase in greenhouse gas concentrations which can lead the earth to be a warmer place. Burning fossil fuel is a major cause whereas car smokes and other pollution sources which are also important causes for that phenomena. In my opinion I think that global warming is a really important issue and it’s a warning for us to act positively toward our world.