I said we had the technology, you condescending dumbass. All those issues are solvable, they’re just not practical to solve. Not right now anyway. If earth became uninhabitable, we would find the money and motivation.

Name a scientific hurdle. Not a logistical one, not an economic one, an actual issue that we do not have the technology to mitigate.

Also, stop being a condescending dumbass. Either thing alone is bad enough, but being both stupid and arrogant is particularly annoying.