another resource that is very limited is farmland, while its true that producing basic crops wouldn't require that much land, but the thing is people aren't happy with just eating bread they want meat and all kinds of fruits, and thats why a single person needs 10000 square meters of fertile land (/a year), and since we already turned most of our forests, wetlands, swamps into farmlands there isn't much fertile land left to sustain our ever growing population.
True, but on the other hand, we are massively wasting the food we have now. With the food we produce these days the whole earth can be fed. Eventhough it is true that farmland is getting limited, it doesn`t have to mean that humanity will get foodproblems. (Besides that, Africa is currently not optimally used and could grow much more food than their own population needs, but they don`t have the money nor knowledge to do that)
The US would walk all over China in a war, and that'd be without having to resort to nuclear firepower
Would the US win? Yes, they probably would (if Russia doesn`t interfere). Will they walk over China in a war? No, they wouldn`t. It would be a massive and long war in which both parties will suffer horribily.
China, Russia, USA War is ridiculous they're three of the most powerful countries and well developed, what do they have to prove.
They don`t have to prove anything, but feel like they have to prove that they won`t back down. Plus they are three of the most powerfull countries, or better said, the three most powerfull countries. What do they have to proof? That they are #1, and not #2 or #3.