Yellow fever is just one of the plagues that will be carried by mosquitoes as they migrate, conquering more and more of a warming world—the globalization of pandemic disease. Malaria alone kills a million people each year already, infecting many more, but you don’t worry much about it if you are living in Maine or France. As the tropics creep northward and mosquitoes migrate with them, you may; over the course of the next century, more and more of the world’s population will be living under the shadow of diseases like these. You didn’t much worry about Zika before a couple of years ago,
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