Having kids has always been a leap of faith. Does anyone think it's "scarier" to have kids now than it was during the Depression, WW2, AIDS epidemic, Cold War, post-9/11, etc?
If your philosophy includes not having kids, then your philosophy will go away on its own in a few decades. Whatever the world will look like 20-50 years from now, it will exclude those people and ideas who opted out of life.
On one hand, it's those people's problems. On the other hand, as someone living in the West, I am very much "in the same boat" with these people. I suspect the danger to our the kids 20-50 years from now will be consequences of demographic decline much more than climate change.
This feels sinister. Why is the idea that the best thing you can do for the future is to die out so popular? If you wanted to destroy a people/country/humanity, you'd work hard to spread the idea of not having kids. So who's doing this?