Hi!
I try to avoid waste before it enters the house. Shop in bulk, use homemade over store-bought, transported and wrapped for many things (bread, snacks, soap and shampoo, clothing if possible, etc), and compost/feed to the chickens what we can. I love that several others have mentioned chickens!
We raise the kids to not expect every trinket out there, and that our family doesn't use certain commonplace products (paper towels, packaged drinks/snacks, etc).
We garden - expanding a little every year. This year I'm going to try to grow Chinese Noodle Beans for the first time, wish me luck :-)