Former Irish president Mary Robinson (L) takes part in a vigil reminding people to pay attention to the global warming, at Bella Center, the venue of the UN climate change conference, on the outskirts of the Danish capital Copenhagen, December 12, 2009. Participants appealed to the UN climate change conference to reach an agreement as soon as possible. [Xinhua]

Desmond Mpilo Tutu (R), Nobel peace prize winner and South African former Archbishop, takes part in a vigil reminding people to pay attention to the global warming, at Bella Center, the venue of the UN climate change conference, on the outskirts of the Danish capital Copenhagen, December 12, 2009. [Xinhua]