Environment and our Life

Earth is the only and special planet. We live in there rely on natural resources. By those natural resources we have the convenient life. But the resources have limited extent. So we have to learn how to save the resource, because it is the most important for us. We need to protect the environment of world. If we can not put into practice, we will live in the worst planet.
Today, we have the most serious environmental problem, which is global warming. The world is getting warmer, that the warming is caused by the greenhouse effect. Burning oil and other fuels releases the gases, which cause the global warming. And the density of population of this world is too high. People will not place to do activities. The resources are short for people to use.
So we need to find some methods to change the appearance of things. At first, we have to fine some resources to replace oil and other fuels, something like solar energy or wind power. By this our resources can continuous use. We need to find other place for human to live, which like Mars or artificial land. After twenty years, the Earth is full old man and no baby, if we can find new place to live.