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Children will be the answer!
Check out this prize winning TEDtalk by Mr Oliver back in 2010. He has something to say; doesn't shy away from some shock tactics either. Wonderful and easy to use as a 45-minute activity. Easy to interrupt and ask the class about their experiences with obese people, illnesses related to bad eating habits etc.
Imagine a guy and a lake full of freezing water.
An inspirational TEDtalk about raising awareness for the changing temperatures and melting glaciers. Easy to use as either a full lesson [add any activity you want] or as a lesson finisher.