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Individuals cannot solve this. I leave trees up, dead or alive. I plant native plants. I remove invasive species. I only keep invasive bushes if they house birds. I don't spray for insects except around the base of my house, I don't kill off chipmunks, voles, squirrels, rabbits, etc. How can this compete with the dozens of neighbors in a half-mile radius that have removed in excess of hundreds of trees, big ones like…
In some areas humans actually increase the biodiversity. My area is mostly desert most of the time. We get our water from the California aqueduct. On my property I have squirrels, rabbits, and chipmunks. I've seen red tailed Hawks and Owls. Cats can't be outdoor here. I've already seen a cat's head discarded on my property. I have so many types of birds here all the time. The open space here has a ton of animals and…
If that's even true, I would say that it is exceedingly rare, even on small local levels. And it would be dwarfed by the rest of human activity killing off biodiversity. I have squirrels, chipmunks, rabbits, voles, foxes, raccoons, owls, hawks, several species of birds like woodpeckers, cardinals, nuthatches, etc., bats, coyotes, fisher cats, deer, bees, wasps, moths, butterflies, dragonflies, hummingbirds, and more all on my properly. Some are there every single day, like the chipmunks and bees, and the others are frequent visitors. But even with all that, the diversity is absolutely lower than what this area would have been like just 200 years ago. For example, mountain lions are gone and bobcats are on their way out. Same with bears. And there are several native plant species that are on their way out as well.
Also, deserts actually can be teeming with biodiversity. It's just not the biodiversity that we recognize.