For me it's the climate - no point in bringing a child in a world with a society that will inevitably collapse and a possible world war over land that's still inhabitable.

Adoption maybe - but for me more children only equal more future suffering - and if not for my children because it'll be somehow possible to shield them from the worst then for a couple of others that have to suffer in exchange when western countries pull up the drawbridge and let the global south deal with the mess they made for those countries...