New government data on temperatures around the world offers cold comfort to those who hope that global warming is on the wane. The data, released on Wednesday by NASA and the National Oceanic and Atmospheric Administration shows that 2018 was the fourth-hottest year since 1880, the earliest year for which reliable global temperature data is available. Experts, including Lab's Amir Jina, an assistant professor at the University of Chicago, say high temperatures are also beginning to exact a number of societal costs, including reduced labor productivity and disruptions of the food supply, along with health problems ranging from a longer, more intense allergy season to an increased incidence of insect-borne diseases.