None of those are technological or even theoretical problems, tho. We (humanity as a whole) thoroughly understand all of them. Whatever your post meant with listing them is stemming from politics more than scientific understanding. I don't think there's a politician's head collider out there, but maybe we should build one.
there was a scene in SG-1 where O'Neill locks up a bunch of aliens in a room and said they would not be released until they came to some agreement.
I always thought there should be a religious army with the entire world's military might, who's central tenet is that they do and decide nothing except enforce what the nations decide - and the nations get to decide in any way they want except violence - but they may choose a champion on each side of a divide, and the champions may hold a knife fight to the death. the army would then enforce the deal of the winner's side.
in terms of higher-order needs, meaningful connection and love are quite a bit more important to me.