Will and Carla Rosenzweig were in town this week, from California. As something a bit special, to celebrate their anniversary, we took them to Clos Maggiore in Covent Garden on Friday 13th – and they reciprocated by taking us today to the restaurant at Petersham Nurseries. Memorably delightful. Discussed the evolving role of ‘sustainability elders’ in our societies. And we also began talking about a possible book launch for Tickling Sharks in the Bay Area next May.