TSIHOMBE, Madagascar — She is just a frightened mom, worrying if her son will survive, and certainly not fretting about American politics — for she has never heard of either President Obama or Donald Trump.

What about America itself? Ranomasy, who lives in an isolated village on this island of Madagascar off southern Africa, shakes her head. It doesn’t ring any bells.

Yet we Americans may be inadvertently killing her infant son. Climate change, disproportionately caused by carbon emissions from America, seems to be behind a severe drought that has led crops to wilt across seven countries in southern Africa. The result is acute malnutrition for 1.3 million children in the region, the United Nations says.

Trump has repeatedly mocked climate change, once even calling it a hoax fabricated by China. But climate change here is as tangible as its victims. Trump should come and feel these children’s ribs and watch them struggle for life. It’s true that the links between our carbon emissions and any particular drought are convoluted, but over all, climate change is as palpable as a wizened, glassy-eyed child dying of starvation. Like Ranomasy’s 18-month-old son, Tsapasoa.