These are not really -ve things compared to what humanity is
doing right now at this time. War, pollution, mistrust, hunger,
wastage of resources. We may not even survive for another 500
years.
On the other hand, we will await your scientific breakthrough in
anti-matter theory or even cold fusion. Prehaps even tapping into
'strings' inside an atom that can alter the base structure?

I dunno but I am hopeful. 