As we all know， water is essential in our daily life. We drink water every day， we use water to wash things and cook food， we also use water to make machines. People can't live without water.

Though about 75% of the earth is covered with water， only 3% of it is fresh water. So we must save water by having a shower instead of a bath. We can save water by fixing dripping taps immediately and we can also save water by not washing under a running tap.

We all live in the earth. The earth is our home. We have only one earth. We must take care of it. It gives us the best environment. If we harm it， it will be angry. And then we will have a terrible end. There are three problems in our earth， they are pollution， disaster and illness.

Its our duty to protect our environment. So we must plant more trees， protect the flowers and the trees， save energy， reduce the pollution. We should ask our government to control the pollution from the factories.

Protecting the nature is very important. Its our duty to keep our environment clean and tidy. If everyone makes a contribution to protect the environment， the earth will become much more beautiful.