Putting your topic in the form of a question will help you focus on what type of information you want to collect: who, what, where, why and how.
Before you start searching, try focusing your topic by writing a one sentence research question. You may also narrow your search by use limiters. You may limit:
by geographic area:
Example: What environmental issues are most important in the Southwestern United States?
Example: How does the environment fit into the Navajo world view?
by time frame:
Example: What are the most prominent environmental issues of the last 10 years?
Example: How does environmental awareness effect business practices today?
by population group:
Example: What are the effects of air pollution on senior citizens?