Global Issues research will involve finding reputable background information, current news sources, and lots of statistics. You will find that many organizations that focus on these global problems (United Nations, Doctors Without Borders, Unicef, World Bank, World Health Organization, etc) have well-researched reports that are full of the information that you need. Any credible source you consult should reference and get their data from these types of organizations.The databases are also excellent sources for finding the statistics and other background info provided by these worldwide entities.
Which countries are affected?
Gender, age, occupation, ethnicity, nationality, educational attainment, etc.
Social, legal, medical, ethical, biological, psychological, economic, political, philosophical?
Look for images that are meaningful and add value to your thinking. Consider infographics, charts, graphs, or diagrams. We have several outstanding books with infographics on global issues. If you search google, make sure you limit your search to an Image Search and check for a credible source.