The environmental group Greenpeace is calling on the Danish government to release four of its members who have been held in jail since Thursday. The activists were arrested after managing to enter the Danish Royal Palace in Copenhagen ahead of a dinner for the 120 heads of state participating in the climate talks. After tricking security guards, the activists arrived just before Secretary of State Hillary Clinton’s envoy. They were arrested after holding up a banner that read “Politicians Talk, Leaders Act.” Kumi Naidoo, the head of Greenpeace International, said, “While the perpetrators of the real crime fled the country on private jets, it is shocking that the Danish authorities have decided to detain, without trial, four peaceful protesters over Christmas. ”