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A major new report reveals a sharp decline in Britain's wildlife - with almost one in six species at risk of extinction. We speak to the naturalist and campaigner Chris Packham, and ask the government's top nature adviser Tony Juniper what can be done to halt the decline. Also on the programme: Meta's Sir Nick Clegg on whether we should be worried about Artificial Intelligence. And - top director Carlos Acosta on creating Black Sabbath - the Ballet.