Is there a reason you feel this will hold true over time despite the region's relative proximity to Antarctica and its broad exposure to the intertropical convergence zone?
Is there a reason you feel this isn't an issue that could be attacked more efficiently either way by engaging it in the same manner that many institutions are currently engaging research research into reducing mosquito populations? Surely the west owes them that much after systematically sabotaging an entire continent. Or is it alright when it's part of the natural status quo?