Are we happy, however, with anything that's beneficial to Earth's long term natural cycle if it happens to come with our own potential / likely extinction? (or at least a very heavy hit to the lifestyle to which we've become accustomed).

I care about the environment insomuch as it's upon what our very lives depend as opposed to the environment in and of itself. It's my enjoyment of the environment and the wonder of its variation that is something valuable to lose, but it's loss is also an existential threat to, basically, me and all those I care about in the universe.