What will it take for cities to go carbon neutral?

Cities emit around three-quarters of the world’s greenhouse gas
emissions, according to the United Nations, and over half of the
world’s 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. Some are aiming to do this very soon. Copenhagen’s 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? Joining
presenters Graihagh Jackson and Neal Razzell: Nick Garnett, BBC
reporter Dr Seppo Junnila, professor of real estate business at
Aalto University, Finland Yvonne Aki-Sawyerr, mayor of Freetown,
Sierra Leone Mark Watts, executive director, C40 Cities Producer:
Darin Graham Series producer: Rosamund Jones Editor: Emma Rippon
Sound engineer: Tom Brignell