Nice unit idea: We are an International Baccalaureate school and this unit is our "Sharing the Planet" unit. It is called Solve It and is all about conflict and resolution.
Panels of 11-year-olds in schools around the country and the world selected the best answer from the explanations chosen as finalists from the more than 800 contest entries. The winning video is below.
Here are a few non-fiction texts that I would include in an intermediate grade classroom library. Some of these texts you might want to group together into a read aloud text set or as a set of inquiry texts that students would read together in small groups.