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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What's it like to be a climate activist and can it be good for you? Protest and civil disobedience have won many of the benefits and freedoms we enjoy today, but what about the activists themselves? Is it all about hardship, risk and stress, or can activists benefit too? Paul interviews research Robyn Gulliver (University of Queensland, Australia) about her research on the wellbeing of activists, and hears again from climate activist Rosie about her first-hand experience of getting involved, organised and arrested. Armed with Robyn's advice, Paul steps out with his local Extinction Rebellion group.

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Why invest all that time, energy and emotions – even risk your personal freedom – when the impact of your efforts on the earth’s temperature will be, at best, invisibly small? Paul interviews climate protester Rosie about her motivation to take action - and asks researcher Ans Verkammen (Curtain University, Perth) about the emotions that drive us to speak out and act up for the environment. Paul signs up to protest with Extinction Rebellion.

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