Guardian: Four protesters held for 20 days in a Copenhagen prison have been released today after embarrassing the Danish state by impersonating world leaders at last month’s UN climate summit. The four, from Greenpeace groups in Germany, Switzerland, Norway and Spain, have had to promise that they will return to Copenhagen for a trial later this year. They will be accompanied by a further five protesters who took part in the action, the details of which were passed to police by Greenpeace this …