Environment lowers your pollution rate. When recovering from an industry bomb, it is the most useful base.
Effect on Map Edit
It adds more green spaces, mountains, trees, etc.
The environment count in bases is also directly rsponsible for the number of fleuries (flowers) below the city name. The first fleurie is granted when environment reaches 500 (in other words, 500 environment clicks are made). Additional fleuries, up to four, is given by the following chart:
|# Of Fleuries||1||2||3||4|
It is not possible to obtain more than 4 fleuries.