Probably contains a few misconceptions.
Now that humanity has evolved with all its attributes of intelligence, the world is undergoing massive ecological & environmental upheaval. The two go hand in hand. Many things we do have changed the environment for the life we share the planet with. Can we look at all the species that have gone extinct since mankind took over as merely collateral damage from our arrival. Man is a product of nature, endowed with Earth changing power, so it shouldn't be surprising that unless a species is equipped to deal with us that they go extinct. What I'm trying to say is: Although we feel responsible for all that's happened recently in the biosphere Earth, well, is that not nature taking its due course? Naturally, when you can't cope to survive, you die. I, like many people, don't wish it but it does seem like extinctions are an inevitability. This is what happens when one species dominates a planet, either conform to them or die.
It's not the fault of species who just happen to lack the adaptive ability to live amongst us, so is it really our responsibility? Hell, are we not just following a path that was forged millions if not billions of years ago? The fact that we are taking note of the consequences of our actions may help save some species but all in all there are more extinctions on the way. Our being here is a natural result of the evolutionary process. Nature will remain as it is, it won't change to suit us. Eventually we may be held accountable by it. If that happens then we will be the ones unable to cope and thus perish. Doomsday prophets may have a better grip on what might happen to us but it will be natural. It's like we think we know everything about nature but might not be even close to realizing what it can do.