Birke Beahr TED Talk
Some of the main takeaways are you should always buy your food from a local farmer and now what has happened to the food. another takeaway is to be careful of what you put in your mouth.
I think he got the messages across to the audience by using the big screen behind him because it really helped to visualise what he was talking about.
Some of the technical support was the big screen behind him to show a lot of photos of some of the stuff that goes into our everyday food.