Warm the arctic, cool the tropics, or both?

I personally would be interested if we (at least in theory) either warm the arctic as well as Antarctica, cool the tropics, or do both. This would cause the difference between temperatures in the arctic and tropics to decrease; winds would most likely decrease in intensity, but the problem that I see is that jet streams and ocean currents would quite literally be messed up, and that could be an extreme effect on ecosystems. However, the thought is still fascinating to me, because eventually, we could just about eliminate all weather disasters. Either that or people shouldn't live where natural disasters take place!