Hello!
The reason why we change forests to cities, and change cities to forest are
....um...Okay, first things first.
1.We have to need a place to dwell in, so we change the forests into cities.
2.However, when we build too much buildings and skyscrapers, there will be
much pollutions such as air pollution, or land pollution, etc.
These are the reasons why we turn things the other way around (you know it).
Hello, Michael! Please take note that if we are talking about pollution, w are talking about something that is uncountable.
- Teacher Macy