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When you're choosing a topic to research, it helps to get a solid overview before diving into the primary research. This will help you introduce the topic to your audience - it also gives you a chance to decide what aspects you want to learn more about.
Where you search informs what kinds of primary research documents you find. For example, the DNR reports and Washington Post analysis can both be found in a Google search, while the climate change adaption book is in Springerlink.