1. Did people lived in harmony with environment for thousands of years?
2. What is the source of Man's life since ancient times?
What is the result of man's attitude towards Nature?
What is a universal concern?
3.we must be active or passive to create a serious system of ecological security?
4.Many cities suffer from smog, don't they?
1. Did people lived in harmony with environment for thousands of years?
2. What is the source of Man's life since ancient times?
What is the result of man's attitude towards Nature?
What is a universal concern?
3.we must be active or passive to create a serious system of ecological security?
4.Many cities suffer from smog, don't they?