Better education reduces world misery in so many ways. It fights poverty, overpopulation, prejudice, and tyranny. I'd spend my time finding humanity's best and most creative people, and just pay them to be them. Sure, you might not pick the right person 9 times out of 10. A Buddhist monastery.
Peace is a renewable resource, but the world lacks enough processing capacity.
Oddly enough, you have seem to have other comp sci interests. Anyone who has put together a large website knows how long and hard the process is. Anyone who has tried to use a large website knows how rarely the process is done well. For a time, I was developing tools to make it possible to generate navigable, comprehensible, usable websites with nothing more that vi. I developed a system that used text files for content, with very minimal mark-up, to generate full websites for various programming courses I was running.