I'm curious what would be an optimal measure of biodiversity.

As in, if certain species decreases, but another increase, it's not clear to me one is more bad than another.

Obviously, wouldn't want entire ecosystems wiped out. I'm just curious what a good measurement of ecosystem health would be.

I'm sure there's one out there hopefully, as technology advances, we'll be able to mitigate the effects we have on the environment, and occasionally, maybe even help it.