| Earth is our home. We must be careful not to harm it. Sometimes, the changes we make to Earth can cause problems.
If we cut too many trees, we might someday not have enough trees. When we move water, we might make someplaces too dry or too wet.
We should not waste our natural resources, and we should use them wisely. We can plant new trees to take the place of trees we cut down.
We can recycle things, too. To recycle means to use something again and again.
|
