Rising heat and humidity due to global warming has prompted major loss in labour hours across the globe. India is one of the worst affected countries, according to a new study led by Duke University researchers. As heat and humidity levels rise because of climate change, options for moving outdoor labour to cooler hours will dramatically shrink, leading to significant worldwide labour losses, the study found. The study, published in Nature Communications December 14, 2021, projected that economic losses associated with this lost productivity could reach up to $1.6 trillion (Rs 1.6 lakh crores) annually if warming exceeds an additional 2 degrees Celsius relative to the present.