When it comes to building food security, biodiversity, employment, spaces that are good for mental health, and so much more besides, we are missing a huge opportunity. Our cities contain many square kilometres of flat roof spaces, currently visited by a few pigeons and that's about it. But what if they were transformed into vibrant vegetable gardens, public spaces for events, places for communities to meet? And what would creating a vibrant network of such gardens unlock? I'm fascinated by the idea that comes up in this podcast of a network of bridges connecting them, a whole new way to get around a city.

So meet my guests, Paola Krug (here is a link to the guidebook she co-wrote) and Katrien Ligt (you can follow her Hamburg work on Instagram here), both of whom are doing amazing work transforming rooftops. You'll never look at a flat roof in the same way ever again. Enjoy. And do let us know what you thought of this episode.

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