Scientists recently confirmed the first mosquito sighting in Iceland. For decades, cold winters drew a line between where mosquitoes could and couldn’t live. But as CBC's Johanna Wagstaffe finds out, that line – and the risk from diseases carried by mosquitoes – is shifting north with climate change. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.tiktok.