Scientists think they can thicken the Arctic’s melting ice by pumping freezing seawater onto the surface during winter. But is it mad science? Or our last hope? Sky's Thomas Moore explains the research and controversies around geoengineering to Niall Paterson. SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews Follow us on Twitter: https://twitter.com/skynews Like us on Facebook: https://www.facebook.com/skynews Follow us on Instagram: https://www.instagram.com/

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