March 22 is World Water Day. It reminds us to save water, because water is the most important natural resource（资源）on the earth.
Water covers more than 70% of the earth's surface, but most of that is sea water. People can't use it directly in daily life.
Fresh water takes up only 2. 5% of the total water.
People in many places are facing serious water problems. One of them is water pollution. Many kinds of waste from cars, factories, farms and homes make rivers, lakes, and oceans dirty. Polluted water is very bad for people's health. And dirty water is also bad for sea life. Now, 34% of fishes are dying out.
The biggest source（来源）of pollution comes from cars and factories. In the beginning, waste from cars and factories pollutes the air. Then, when it rains, the rain water comes down and makes our drinking water dirty.
Scientists say that in 30 years, more than half of the people in the world won't have enough clean water. We have to learn how to save water. Here is some advice.
★Turn off the tap while you are brushing your teeth. You can save as much as 450 liters（升）of water each month.
★Leaky（漏水的）taps waste a lot of water. Fix them right away!
★You can easily cut your shower time short, and you'll be still clean.
★When you wash the dishes, don't let the water run.
★Only wash clothes when you have a lot to wash. If your washing machine isn't full, you're wasting water.
