In addition to the Discovery Service, you could search in a specific collection related to Environmental Studies.
You can also search the Post & Courier for newspaper articles about environmental issues and projects in Charleston.
A general web search can yield good information, from local goverment and local non-profit organizations. Pay close attention to which websites you land on--city and county government sites will be reputable sources for official initiatives and reports. The Coastal Conservation League is a local non-profit that is very active, and there are also a number of smaller organizations.
Once your group is assigned to a breakout room, click on the link that corresponds to your breakout room number.