A healthy ecosystem is a subjective topic as is everything because we now know that Nothing Has Meaning without point of view.
Balance is one concept touted in any discussion of ecosystems.
Assuming that the earth is an ecosystem we can also assume that the degree to which the earth can sustain any given state would be an indicator of balance. The earth is out of balance due to human beings.
Then again, balance is subjective so who is to say what is in balance? See my article on the earth’s attitude.
Still, we have to make assumptions here so let us define balance as an earth that will sustain life as we humans desire, generally, a life that is also good for other living things.
The earth is out of balance.
The solution to this problem?
Vote no on the human race.