I don't believe most people reading this post are under any illusions about cats and the effects they have on wildlife populations. We know they are killing millions (and apparently billions) of native wildilfe (e.g., birds)
As a cat owner myself, I've often pondered over this question: Will I "replace" my cat when he dies? (I use "replace" loosely because we all know that you can't replace a family member).
I have not had cats in my life too often because my family have always been "dog people" (let's not debate on dog vs cat people here ;) ). Roxas, my ginger tabby, is 2 years old, and is an indoor cat. He is loveable, playful, and by all visual cues, seems to be very content being an indoor cat. The last time he "escaped" in fact, he returned no more than an hour later, and cuddled up next to me on my bed, purring and happy. In short - Yes, I would likely get a new cat when Roxas is gone, but would maintain the responsibility of keeping the cat inside and happy. I've even gone so far as to build a "cat run" - a large, caged in area outside my house that is attached via a tunnel to the bathroom window, which is always open. This way Roxas can go outside any time he wants, without killing native birds.
Anyways - my questions to seabird people are:
1) Do you support limiting cats (feral and pets)?
2) Do you know of any studies where cats have played a huge role in decimating populations of seabirds anywhere in the world? If so, would you be willing to share that story here?