Human activity has already changed the climate, with profound implications for human
health and health-care delivery. 1, 2 The world has warmed by an average of w1 C above
the preindustrial era but with substantial geographic heterogeneity. 1 Because greenhouse
gases (GHGs) continue to accumulate in the atmosphere, more warming is inevitable;
globally, warming of 1.5 C or greater will be exceeded this century in all but the most
optimistic scenarios, and warming could be as high as 5.7 C. 1 The last time global surface …