Press Association: Activists from the group Climate Camp vowed today to return to London over the August bank holiday for their annual summer protest against global warming. Climate Camp was last in the capital in April, when they set up tents and stalls in the City of London as part of the G20 protests, in which one man died and the tactics of police officers were criticised. The climate protests in April focused on the European Climate Exchange on Bishopsgate, the centre of carbon trading in …