We know what we need to do. We need to effectively stop and/or reverse some human impacts.

At one time, for example, we could preserve large tracts like Yellowstone. We know now, that even that, is too small for the animals in its ecosystem.

We could (probably) save wild salmon on the OP, north of Grays Harbor watershed, by essentially depopulating it. Manage the land in such a way that human impacts do not harm the fish at all. But, that slab requires fixing the ocean and similarly reducing human impacts.

JustBecause identified that our society is founded on growth. As we have more people, we need more food, water, fiber, energy. The earth has a fixed amount of resources and as we get more people, they need more which takes it away from the resources.

As humans evolved we moved out of the ecosystem, where we were no more than a functioning part of it to a creature that is able, for the time being, to avoid the ecological consequences of stupidity. The Human Race is trying really hard to win the Darwin Award.