For instance, we use no pesticides, fungicides, rodenticides, etc. in or around our home and we keep an area in the back "rough." We also keep a source of fresh water (low birdbath with a heater in Winter) available. As a result, our unfenced, suburban plot has a remarkable plethora of animals and birds. On less that one acre, we have a lively little ecosystem and haven that has grown to the point where "pests" are handled by their natural predators! We often have a yellow jacket (ground hornet) nest crop up. If we mark it off so we don't accidentally annoy them, the neighbor hood skunk finds her way over and eats the entire nest (adults, larvas and eegs) in one night! The foxes that travel through are good at catching mice while the hawks and owls eat their fill of them, too. (Best of all, these predators are not being sickened by poisoned pray!) The swallows and bats take care of the mosquitoes and biting gnats and the garter snake, frogs and toads take care of many other pesky insects. A coyote is roaming the neighborhood, beavers live two doors done at the river and a small herd of deer make our yard a stop in their nightly foraging foray.
These are simple methods we share with our apprentices and each in turn is making their own inroads.
Have we solved the larger degradation of the Earth? No. But we have preserved and healed a bit of it! As each one makes whatever changes that can, to plant native species of plants, provide safe spaces for natural species and care for their little spot of Earth, the better it becomes for the whole.