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The Vatican has published a report calling for mankind to take "decisive action" on climate change. In a new report on glacier melt, the Vatican's Pontifical Academy of Sciences appeals to all nations to reduce their impact on the environment, as "we all live in the same home". But will the faithful listen, and will the Catholic church be able to rouse humanity to action on climate change where so many other international leaders have struggled? One Planet goes behind the scenes at the Vatican to talk to Marcelo Sanchez Sorondo, chancellor of the Academy of Sciences, about the report.

Also on the show, we ask whether science and religion can ever be compatible - we get opposing views from Professor Richard Dawkins and Chancellor Sanchez Sorondo.

Plus, we check out the Vatican's solar panels, talk to the pilgrims on St Peter's Square, and check out the view from the tallest building in the world's smallest state.

As ever, tune in, have a listen and then let us know what you think. Email the team at oneplanet@bbc.com, or join in the conversation on our Facebook page - the link's below.