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This weekend, representatives from over 170 countries will be meeting in Qatar for the latest CITES conference - the key gathering that occurs every three or four years to discuss global conservation of our most endangered species.

With that in mind, Mike heads to the Zoological Society of London to come face to face with some of the world's rarest animals - and ends up being fascinated by a Sumatran Tiger. He chats to conservationist Helen Meredith about why biodiversity matters, and we hear from Tokyo about a species of fish that's likely to dominate much of the CITES conference - the Atlantic Bluefin Tuna.

Also in the show, we hear from author Michael Green about why taxing the banks to help global poverty is not a good idea, and we go to America to get an update on environmental stories there.

As ever, tune in or download the podcast and let us know what you think. You can email Mike and the team at oneplanet@bbc.com, or join in the debate on our Facebook page, the link's below.