可持续发展：
The idea of sustainable development has been accepted by the world. How to keep sustainable development is a big problem facing our planet.

The present situation is worrying. First, natural resources are becoming less than before. Second, as some people are not aware of the importance of the environmental protection, the problems with it remain extremely serious to some degree. The gap between the rich and the poor has the tendency to become wider and wider.

To our great joy, many countries have taken action. On one hand, they have made relevant laws and regulations and put large amounts of money into the environmental protection. On the other hand, popularized education as well as international cooperation is being carried out.

As for myself, I should take the responsibility to dedicate myself to sustainable development. Our future and the lives of our children and our grandchildren won't be in danger if we all realize the problem and do something we can in our daily life.