1. Yes because the natural environment is one of the most important parts of human life, it gives us O2 to breathe, and absorb CO2, and makes us become healthier. In addition to making humans healthier, it also balances the ecosystem so we must protect it.

2. In my country, there are some who care about the environment but there are some not. Why? Because some think that why I have to care about it? it is just a natural - condition. And some think humans are one of the making environment become worse so they have to clean their neighbour, not to throw the trash into the road,...

3. In my country, there are so many pollution problems: noise pollution, air pollution, water pollution, soil pollution,...

4. Kinds of natural disasters that I have heard of are: drought, flood, hurricane, storm, volcanic eruption and avalanche. Drought is a natural disaster that really hot and makes everything become sterile and extreme. Flood destroys houses and makes people difficult to go anywhere,...

Note: 

absorb(v) hấp thụ

O2, CO2(n) oxi, khí cacbonic

natural-condition(n) điều kiện tự nhiên 

drought(n) hạn hán

avalanche(n) tuyết lở

sterile(adj) khô khan

extreme(adj) khắc nghiệt