A: Hey B. Have you finished the assignment on pollution yet?

B: Mm, not yet! I am working on it. How's about you?

A: Me too. What have you studied on so far?

B: I have collected the information about the definition and types of pollution.

A: Cool. Can you tell me?

B: Oh, well, pollution is the introduction of contaminants into the natural environment that cause adverse change. There are four main types of pollution: air pollution; water pollution; soil pollution, and noise pollution.

A. I heard that there is visual pollution also. Have you studied on it?

B: No, I haven't. Can you tell me something about it?

A: It is an aesthetic issue and refers to the impacts of pollution that impair one's ability to enjoy a vista or view. Visual pollution disturbs the visual areas of people by creating harmful changes in the natural environment.

B: Oh, so billboards, attenas can cause visual pollution, can't they?

A: True. They are causes of visual pollution.

B: Have you written about effects of pollution?

A: Yes, I have. I have described its effects on human health, environment.

B: Oh. I am planning to work on pollution control by government.

A: It would be better if we worked together.

B: True. How about learning together?

A: That's a good idea!