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Do we understand the urgency of the global biodiversity and climate change crisis? Stephen Sackur speaks to the director of the Royal Botanic Gardens at Kew, Richard Deverell. Kew Gardens in London is a UNESCO world heritage site and home to one of the largest collections of living plants in the world and an unrivalled repository of preserved specimen plants collected by scientific pioneers such as Charles Darwin. Richard Deverell has big ambitions to put Kew at the centre of the fight to avert environmental catastrophe by helping the public to grasp the scale of the challenges caused by biodiversity loss and a warming planet.