What Does it Mean to be Green? is great for teaching sustainable ecosystems & human activity, climate change, carbon footprint, human impact on the environment, conservation of energy, and more! Also a great read-aloud for Earth Day.
Food Waste is a major problem. Here's a tip: Use a Vacuum Sealer and refrigerate or freeze your leftovers and bulk buys. And be sure to label them! Vacuum sealing will dramatically increase the freshness of your foods. You will still have to be proactive and keep tabs on your fridge and freezer.