Hot and muggy weather over the past few decades has led to about a 10 percent drop in the physiological capacity of people to do their work safely and those drops will be even greater as the climate continues to warm, a new study finds.

People may continue to work in the hot and muggy conditions, “but their misery will increase while they are productive,” John Dunne, a research oceanographer with the National Oceanic and Atmospheric Administration in Princeton, N.J., told NBC News.