A lot of things are solved, but capitalism means that we need a profit motive to act. World hunger is another good example. We know how to make fertilizer and how to genetically alter crops to ensure we never have a crop failure. We have trains and refrigeration to take food anywhere we want. Pretty much any box that we need to check to solve this problem has been. The places that have food problems largely have to do with poverty, which at this point is a polite way to say "I won't make money, so I am okay with them starving"
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