Fonterra Milk - recycling

At school we are starting to get milk delivered from Fonterra. After lunch someone from the class will go and get a box full of cartons of cold milk and hand it out to the class. After that we have to fold it in a certain way. When all the cartons of milk have been folded and put in special bins they get sent all the way to Malaysia and get  made into roof tiles and booklets for people. 
I think the idea of having milk at school is good because milk makes your bones strong.