World in Progress: Climate change to help spread mosquito-born viruses

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05:49 mins.
Mosquitoes that transmit viruses like dengue and Zika thrive in the tropics. But as the world gets warmer, scientists warn these insects will spread further afield, potentially exposing millions more people to tropical diseases. Dr. Rachel Lowe at the London School of Hygiene & Tropical Medicine explains how rising temperatures impact the tiny mosquito.