Contextualizing the issue is important for your readers to be able to understand what you're discussing before diving into the specifics. Consider using books to provide an overall view of your issue by using WorldCat Local.
You'll notice that some databases will likely be more heavily focused on the natural sciences side of things (e.g. ScienceDirect), while others (e.g. ProQuest Direct and JSTOR) can help you find more information about the cultural and political issues surrounding your topic.