please help me with the environment vs environment?

what is the difference between environment and the environment?
please explain to me.
thanks in advance!

“Not a Teacher”

The noun environment is generally used with the definite article the.

[b]the environment[/b] the air, water, and land on Earth, which can be harmed by man's activities:
e.g. 1) Some of these chemicals are very damaging to [b]the[/b] environment.
       2) legislation to protect [b]the[/b] environment
       3) the effects of acid rain on [b]the[/b] environment
       4) the government minister for [b]the[/b] environment