Guardian: I’m trapped. To my left 300 police are jumping out of transit vans clutching riot shields and running towards a march of 1,000 climate change protesters. To my right another 150 officers are hiding behind a high wire fence about to pounce on 70 protesters who are within 300 yards of Kingsnorth power station. And in front of me is the station itself. A monument of grey 1960s architecture surrounded now with electric wire, 10ft-high steel fencing, makeshift watchtowers and …