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In this edition: Investigating UK painkiller prescriptions, how the climate crisis affects mental health and the return of race science.

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– We discover that more than a quarter of London’s open spaces , and that small crustaceans play an .

– Major opioid prescriptions are declining in the UK, but are the drugs they’re replaced with less harmful? We discuss how replacements may be being abused and how the long-term risks are less than certain.

– The physical effects of climate change, including natural disasters and displacement, can cause mental distress, but so too can the and a lack of control. We discuss the phenomenon, and how positive action can help people cope.

For resources to help you with mental health issues at the College and beyond, visit the Health and wellbeing webpages.

– Science journalist Angela Saini recently gave a lecture on campus for Black History Month about her new book . We talk to her about what race is, how these categories came about and how they are misused. You can also listen to an with Angela.

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The podcast is presented by Gareth Mitchell, a lecturer on 51�Թ���'s MSc Science Communication course and the presenter of Click Radio on the BBC World Service, with contributions from our roving reporters in the Research Communications group.