Read the following passage then answer the questions

Tropical rain forests are found in Amazon region of South America, central America, Africa, South and South east Asia. Rain forests are very important to the world's climate. The Amazon rain forests alone receive about 30 to 40 percent of the total rainfall on the earth and produce about the same percentage of the world's oxigen. Some scientists believe that the decrease size of rain forests will affect the climate on the earth, making it uncomfortable or even dangerous for life. Saving our rain forests is an international problem. One country, or even a few countries can not solve the problem alone. The nations of the world must work together to find a solution before it is too late.

Questions:

1. Where are the rain forests found?

2. How much percent of the world's oxygen do the Amazon rain forests produce?

3 . How will the decreasing size of rain forests affect the climate on the earth ? 
 

4 . Is saving our rain forests only a national problem ?