The climate crisis is ‘unequivocally’ caused by human activities, according to a report from the IPCC. One attempt to conserve the environment, being pushed by Boris Johnson, is to protect 30% of UK land in a boost for biodiversity. A Guardian exclusive found that an area twice the size of Greater London is devoted to grouse shooting in UK national parks, which threatens efforts to tackle the climate crisis. Patrick Greenfield and Phoebe Weston investigate whether national parks benefit the environment and biodiversity, or if there might be a better way of doing things. Help support our independent journalism at theguardian.com/sciencepod