@darnell You must take into account that many European countries are very crowded already - or at least many regions are.
e.g. Switzerland has only a small portion of its area which is suitable for housing, agriculture,... and its already very much used. There is a natural limit. Also due climate change resources especially in the apls will reduce. A lot of energy today comes from glaciers (water power). Also drinking water. But the glaciers will vanish in just in the very near future.
Especially Switzerland will already have a hard time to source water, power,... for the current number of people.
Just not addressing the problem today won't save you from the problems to come.
And there won't be any "technical" solution like "small nuclear reactors" or so.