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Limiting global warming below 1.5 degrees Celsius, as per the UN Paris Agreement, would stop dengue spreading to areas where incidence is currently low, say researchers. Dengue is the fastest growing mosquito-borne disease across the world today, causing nearly 400 million infections every year. According to the World Health Organization (WHO), in the last 50 years, dengue has spread from being present in a handful of countries to being endemic in 128 countries and its incidence has increased 30-fold in this time period.