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CNN's Nick Paton Walsh travels to Midway Atoll in the Pacific Ocean to investigate how the plastic we throw away everyday enters the food chain and possibly, our bodies.

The mother of all "field trips" . Take students around the world, sleep in tents, dive on reefs and help with data collection.

I use this at the beginning of the year. Kids are always surprised that although they do not travel often, they still consume a lot based on lifestyle.