No, humans are, and our uncontrolled population is, and all that comes with it. Our waste, our consumption, and our pets. A reasonable human population with pets wouldn't ruin the environment, but billions of us?

Sure, we'll ruin it just by being human, and all that goes along with it; for millennia, that's included cats.

Cat lover?

Deathly allergic actually, but I'm honest about the reality of humans and the planet. Life we favor thrives, or life which thrives in conditions we create becomes dominant. We reshape the environment, and that includes mass settlements with pets.

Any one issue wouldn't be an issue without the others... if birds were not under pressure from every conceivable angle, any one angle wouldn't be a catastrophe. The real issue is holistic, and it is us. For birds it's habitat loss, pesticide and herbicide, hunting, poisoning, trapping, mirror-solar arrays, wind turbines, cats, etc... etc... etc...

The story is the same everywhere, and the nature of the pressure is that there are too damned many of us.

Or so the Toxiplasmosis Gondii parasite in your brain would have you believe.