Sustainability in different continents

Alison van Diggelen set up Fresh Dialogues in San Jose, California - an online journalism portal that focuses on green business issues.
She talks to business leaders, campaigners and activists about finding sustainable solutions; and changing the way we impact our planet.

Alison is joined by Jean Lee, a former North Korea correspondent. They both talk to the BBC's Mark Whittaker about sustainability and climate solutions in their respective cities.