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This week we're in Azerbaijan by the Caspian Sea exploring how this small country is becoming increasingly influential in the global energy markets. We speak to the country's deputy energy minister, plus the state oil company about their ambitious plans. Also in the show, we visit Sumgayit - a city once labelled the most polluted in the world - to explore the social cost of our hydrocarbon era. Plus we visit a mountain on fire, the stunning Yanar Dag.

As ever, tune in, have a listen and let us know what you think - the email address is oneplanet@bbc.com. Or join the team on Facebook, the link's below.