This evening at the climate conference center, there is a line of young adults sitting along the main aisle in the main hall, holding placards and pieces of paper with slogans demanding a strong, effective climate treaty.

They are the only sign of the confrontation between youth climate activists and UN security earlier in the day.

Rachel Butler, a American, told me that they are sitting in solidarity with their cohorts who were either taken out of or barred from the center today, and not as part of any formal organization. Staffers of Friends of the Earth International, one of the largest global environmental groups were refused admission to the conference center today by the UNFCCC.

Other civil society groups seemed to enter without problems, although their access has been severely limited by the UN officials, who cite the capacity of the venue as the reason. Non-governmental organization (NGO) representatives must now have two forms of UN ID to get in: an accreditation badge, and an additional "white card." Staffers are trading the cards among themselves so that everyone can get some time inside.

Butler says Avaaz.org, the international youth activist group, was barred as well, although I have yet to find any confirming reports, and it's too late in the evening to hunt up a UNFCCC press person to ask.

"We're part of the 'International Youth Climate Movement,'" Butler said -- a sort of viral identity among youth activists rather than an official affiliation.

Butler declined to identify the organization under which she is formally credentialed to be inside the climate talks venue. "We're showing support as individuals, not as part of any particular organizations."

A staffer for an international social justice group, who asked not to be identified due to the tense situation between the NGOs and the UNFCCC, said that this kind of limited access was not typical of past negotiations. As for security dragging youth activists along the carpet to break up a demonstration? "That was a complete violation of human rights, by those who are supposed to protect them."

See more of Emily's reports from Copenhagen as part of OnEarth's ongoing coverage.