A:This month, the air is very hot. Why do you not buy air conditioner?
B: I plant trees around the house instead.
A: oh, that's why?
B: If you don't buy an air conditioner, we could save a lot of money
A:Wow, That is a very good idea.
B: And, If we plant lots of trees, we could help preserve nature.
A: oh, i understand...How do you help to preserve the nature?
B: Umm, we use cloth shopping bags,
A:
B: