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The Deepwater Horizon disaster generated a lot of grim statistics. Twelve months on, we ask those involved in the clean up operation, and those impacted by it, to reveal the number that matters most to them. Our reporter Laura Sheeter meets with the US Coast Guard, scientists and oystermen to learn the statistics which sum up America's worst environmental disaster.

Also in the show, following recent reports that ice loss in the Arctic is faster than predicted, we put a call into scientists at the Arctic to ask why we are repeatedly underestimating ice melt.

Plus, Mike spends the show in a London book shop to celebrate UNESCO's World Book Day - thanks to all who suggested their favourite book on our Facebook page. If you haven't joined the team there yet, do come along, the link's below.

And finally, we head up the tallest building in Quito - which happens to be a church - to take a fresh perspective on the capital of Ecuador. As ever, tune in, have a listen and then let us know what you think. Email the team at oneplanet@bbc.com.