A new report from UNICEF estimates that nearly all the world's children – more than 2 billion – will be exposed to high heat-wave frequency by 2050. That is about 1.5 billion more children than are exposed now. "The models tell us this is the case, as does empirical lived experience," Lauren Gifford, a research scientist at the University of Arizona, said in response to the report. "Children now and children who haven't been born yet are going to exist in the world in very different ways, and some of those ways we can't even conceive yet."