The way I get my kids to understand how nature is in everything we are and we do is we source all our materials we need from the forest, garden, beach. We are careful in how we harvest and take as little as we need. All their tools like needles, knitting needles, spindles, hammers, etc are made from materials found in nature. They seen how clot is made because they've helped grow and process it (linen), they use wool from sheep they've met and recognise from farms they frequent. I feel that's the best way for my city kids to have the knowledge and care for the world around them.