To put this in some context, apocalyptic witchcraft is similar to what might be called radical green witchcraft. It is a practice of the craft that calls a witch to not only tend to the natural world but further, to do so while acknowledging that humanity has destroyed most of nature. Yes we helped cause global warming, I'm not denying that, but at the same time is there a need to pair that with a declaration that when we are all dead that the trees will reclaim their right full place without a thought to our by now extinct human race? Not in my opinion there isn't.
I don't know about you but I've built some strong relationships with tree spirits. I tend to my plants with love, my boyfriend and I rush out to our balcony when it gets windy to rescue my green babies from the wind. I can't imagine that the such spiritual beings as plants would simply grow over our graves with giddy delight at the idea that we were all gone or with nonchalance because we had presumably done this to ourselves. I'm not saying that plants would remember us because we are humans and the highest form of evolution and blah blah blah but because we (at least some of us) made friends with them. To me that is the largest fault with this theory, the fact that it presumes to know how trees and plants will spiritually react if we go extinct because of global warming.
So I guess to wrap it up, you could say I'm simply not a follower of apocalyptic witchcraft. Personally I think that the relationships we build with the natural world will endure, no matter what happens because those spiritual relationships that are built with honesty and good intent never truly disappear.