People can adapt, things just aren't bad enough yet to get them to. There's still the illusion many people convince themselves of that everything is fine. When that illusion is incompatible with survival, people will change.

If the weather isn't survivable for long periods, we can build underground shelters. If there are shortages of food and water and home gardens die, we can build storerooms and greenhouses (perhaps underground with artificial lighting) and wastewater recycling. Use wind power (or solar, if the panels can withstand the weather) for electricity to grow the food, recycle as much as you can, and spend any excess labor doing what you can to improve the chances for life on the surface to recover. It sounds terrible compared to our current luxury, but societies have lived (and had kids) through worse.

If you don't want to bring children into a world comparable in quality of life to a 13th century medieval European city, okay. But know that if there is a future, it will be because some people did have children. (Alongside lots of other important reasons).