What scientists study environment?

The environment is a gigantic and immensely complexsystem. It is impossible to study every aspect of it. It is divided into many different fields of sciences.

For example:

Geologists: Studying the ground, plate tectonics, volcanoes and so on.

Zoologists: Studying wildlife.

Paleontologist: Studying prehistoric life.

Botanists: Studying plants.

Meteorologist: Studies the weather.

Environmental studies: Studying humanity's interaction with the environment.

There are so many sciences concerning the environment and not only its present state but also its past, its evolution or trying to predict its future etc. that it is impossible to list them all.
an ecologist :)