Countryfile takes a look at our cities and the green spaces and wildlife that can be found there. Anita Rani is in London at the remarkable Woodberry Wetlands, a haven for all sorts of wildlife just a stone's throw from the tower blocks of Stoke Newington. She spends time with the locals keeping this patch of London green and meets 'guerrilla explorer' Daniel Ellison, a man on a mission to make London the UK's first National Park city. Anita also meets up with urban wildlife photographer Sam Hobson to see if they can photograph a pair of nesting common terns and the very rare hornet moth. Sean Fletcher is at Manchester Airport with the environment team. It's their job to make sure that the impact on the wildlife and the environment around the runways is kept to a minimum. He also spends time with the crack squad of bird scarers who use some clever tricks to keep wild birds off the runways. James Wong is in Liverpool seeing how rooftops and disused spaces are being used to grow fresh vegetables. Tom Heap looks at air pollution and finds it's as much a problem in our countryside as our cities, and Adam Henson meets the ex-serviceman helping other ex-forces personnel rebuild their lives through farming.