We've been reproducing since we first started walking upright and discovered if we bang some rocks together they can make fire.
Your ancestors endured plagues, lived as serfs, peasants, or in some cases slaves for generations. They lived through wars, extreme weather events, famine. They brought children into those environments, some of those children managed to grow up, and they had children of their own.
It was ever thus, and will always be.
Climate change is a scary prospect for sure. Nuclear War? That didn't stop our parents or grandparents when the threat of the cold War loomed over them. Financial crisis? We were having kids when the majority of us didn't own homes and lived on the masters land.
There will be a societal shift coming, there has to be as our current course is unsustainable. Life may not be as "good" for our kids as it has been for us when we were kids, but it will still be better than 99% of human history, and if they are in the UK it will still be better than probably 80% of the rest of the world even today.
By all means don't have kids if you don't want them, but why fearmonger towards those that do?. I have a young child and we'll have another if we can. Part of my job is to prepare them for the world as it is, and for what it may become, and to put them in the strongest position to survive and do well in whatever future comes to us.
If we're going to go out in a flash of light it won't really matter anyway, as we'll barely have time to register it.