Great opportunity for students to contribute to US climate records by tracking phenology of local plant species. Lots of helpful resources for teachers at all grade levels, and appropriate for many areas (not just science). Show students how they can quite easily participate in real, meaningful research that encourages them to care for and observe the environment!
Saving the planet for future generations has to be a priority of our educational system, now. This video has great visuals. I also recommend reading Falter by Bill MacKibben.