The adoption of a new agenda to transform the world's cities will be "useless" unless countries and cities implement it.

That's the passionate view of Joan Clos, Secretary-General of the UN's Habitat III conference which ends on Thursday in Quito, Ecuador.

The once-every 20-years conference on Sustainable Urban Development has been focused on making cities and towns better places to live, through a non-binding New Urban Agenda, agreed by all Member States.

Rocio Franco asked Mr Clos if the conference, attended by up to 45,000 people from across the world, in the Ecuadorian capital, had been a success.

Duration: 2’39”