This topic is very popular for today. Every day we can heard a lot of new informations about global warming. Smog is one reason. At first every year many people is born and civilization needs more space for living and more cars for moving. They are felling the trees, which means, that they are destroying the lungs of our planet. Second problem is a lot of new cars produce smog which causes acid rain. Acid rain it is a rain with carbon dioxide, which is very dangerous for all live creatures. Every day it is raining and this dangerous rain is filling the lakes, rivers all other water resources. All creatures such as fishes or plants are deaden every day. Finally these all problems are one big circulation, because if every water source will be with no live creatures, water will be more and more pollute and the people will pay off it.