This is such a skewed PoV of the world today. In so many ways the world is the best it's ever been: Poverty, violent crime, etc. (the list really does go on and on). This is especially true if you live in a developed nation. So I'm not really sure what you think a child will have to "endure" aside from all of the great joys life can bring!
We can even just focus on climate change. The "worst case scenario" most scientist project isn't really even that bad. Sure there will be worst weather events etc., but society isn't going to "collapse". And what about you? If society "collapsed' in your lifetime, would you really rather have not lived at all?
I'm not suggesting your anxiety about the current state affairs isn't the motivation for your decision (although it is a convenient scapegoat), rather, that your anxiety may not be all that rational and you may want to revisit your decision from time to time!