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Cities emit around three-quarters of the world\\u2019s greenhouse gas emissions, according to the United Nations, and over half of the world\\u2019s population now live in one. Many have set ambitious targets to slash and offset their emissions, in the hope of neutralising their impact on the environment and slowing climate change. \\n \\nSome are aiming to do this very soon. Copenhagen\\u2019s goal is 2025. More than 700 others have committed to targets over the following decades. But how does a city, choked with traffic and packed full of buildings that require huge amounts of energy, actually go about achieving carbon neutral goals? \\n \\nJoining presenters Graihagh Jackson and Neal Razzell:\\n \\nNick Garnett, BBC reporter \\nDr Seppo Junnila, professor of real estate business at Aalto University, Finland\\nYvonne Aki-Sawyerr, mayor of Freetown, Sierra Leone\\nMark Watts, executive director, C40 Cities\\n \\nProducer: Darin Graham\\nSeries producer: Rosamund Jones\\nEditor: Emma Rippon \\nSound engineer: Tom Brignell