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Hidden health hazards of climate change

Climate change is a health hazard. Air pollution and changing weather patterns give rise to heat-related illnesses, such as asthma and allergic disorders. According to the Centers for Disease Control, insect-borne diseases from ticks and mosquitoes have tripled in the United States in recent years, and warmer weather is largely to blame. Interviewed: Jonathan Patz, director, Global Health Institute, University of Wisconsin-Madison.