Avoiding weak thesis statements
It is important not only to have a thesis statement, but to have a good one. A weak thesis statement is almost as bad as not having one at all.
Here are a few thesis statements you'll want to avoid - because they'll lead to weak papers with poor grades:
Way too vague and broad.
What constitutes "major impact"?
What aspects of the environment are we talking about?
What century are we talking about?