For decades, the world seemed to be winning the war against mosquitoes and tamping down the deadly diseases they carried. But in the past few years, progress has not only stalled, it has reversed.Stephanie Nolen, who covers global health for The Times, explains how the mosquito has once again gained the upper hand in the fight.Guest: Stephanie Nolen, a global health correspondent for The New York Times.Background reading: Climate change has brought disease-spreading mosquitoes to places they have never been found before, compounding the problem.One invasive malaria-carrying species thrives in urban areas and resists all insecticides, threatening catastrophe in Africa.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.