Create a game (for all ages) where you compete to use as few resources as possible, and enlist some popular recognizable faces to help promote it. A few opportunities for a younger person to experience actively reducing resource use will get them thinking and creating on their own. At our house, we play "living at sea on a sailboat", so we think of how much water and electricity we use, and how to make healthy dried food meals, primarily vegan. There are many variants on this, play for a few hours to a day.
Idea No. 155