That is a good an important issue to discuss. However, it would help to narrow the question a bit to make it easier to research. "The environment" is a big topic, so one way to narrow it would be to focus on a part of the environment. Another way to make a question better is to use "what is the best way" or "what is most important" statements to qualify the idea. Here are some possibilities:
What is the best way to improve our air quality?
Which is the most important focus for environmental activists?
How can an individual best help protect the earth?
What can college students do to protect the environment?
Which nonprofit environmental group is doing the most to protect the environment?
How can governments best protect the environment?
How should (put name of country here) protect the environment of their nation?