Creating a chain, where the schools send something forward and a reaction to the previous group backwards and so on and so on.
Passport to the world: All schools fill a page in the passport with information what to do for the earth
Building bridges: The kids build actual bridges ( out of paper or so) that can be used in the movie to connect the countries. Eco-chan could walk over the bridge.
Instructions in 3 steps ( Japanese program 1.2.3.) Instructions on what steps to take for an environmental improvement in 3 simple steps.
Kids make a city scape collage out of old magazines Eco-chan can walk through the city.
A puzzle where all schools make a piece of a jigsaw puzzle and it all fits together in the end
Role play, miming, using gestures and signs.
Center of our Logo Eco-chan is a Docodemo door ( Doraemon) The kids can go from one location to the other.
Quest / Challenge the kids have to full fill some tasks
Message in a bottle, the kids write down their message, question etc and put it in a bottle and I will bring it to the next group.