In this final podcast of the season, Paul discovers that religion can have an important influence in how we use natural resources. He continues his journey South, finally reaching the Sahara Desert. At a well frequented by nomads, local guide Zakarya explains why water is precious but also why you shouldn’t have to pay for it.

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The Draa valley in Southern Morocco is one of the driest places on Earth and getting drier. Paul talks to local residents and farmers about a system of sharing water that has been operating for over 500 years - a longstanding example of a successful "commons". In a world where access to scarce resources is leading to conflict, commons may offer insights about achieving more sustainable and equitable approaches to sharing our planet. Researcher Sabina Pedrazzini explains what psychological factors can contribute to the success of a commons.

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Paul explores how surface travel may effect the brain in different ways compared to flying. Could the sciences of mind and brain help reduce carbon emissions due to flying? Paul spends 3 days travelling from Bristol to the Sahara desert by public transport, and reports on how that feels compared with a 3 hour flight from his local airport. On a cycle tour around Marrakesh, we meet Yessir who explains what it's like to live in a country where droughts are becoming more common, and we find out why scary public information campaigns may not always change public behaviour.

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