Do you think that nuclear war would stifle plans to reduce global warming, curtail settlement on other planets and lead to less globalisation of consumer products?

I think this is something that we really need to try, to be sure.

I think that any speculation about what would happen (or not happen) as a result of nuclear war is just pure spitballing. No way to know.

For example, if billions of people die and countries are destroyed as a part of a nuclear war, you could predict that industrial and manufacturing industries would cease to exist, too. And the people would be dead, meaning less consumption. So on that basis you could assume that pollution would decrease as well.

Of course, civilization would be pretty much decimated.

So billions of people would be dead but the environment would be much improved. The Sierra Club’s wet dream.

Nuclear war ?
Then the priority would be to survive first.
Global warming would be last on that list.

Yes, yes, and yes. There would be no people left to consider any of those things.

Nuclear war would stifle a lot of things.