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Gordon Brown marks World Aids Day by praising Aids workers around the world "who refuse to give up".
US President Barack Obama addresses gay rights group, the Human Rights Campaign.
Greenpeace activists occupy the roof of the House of Commons in a bid to make politicians take action on climate change.
In the run-up to the Copenhagen summit, Christian Aid have staged a second "Mass Visual Trespass", projecting images onto the Houses of Parliament.
World leaders mark the 70th anniversary of World War II and reaffirm the aim to never see another world war.
Obama leads the tributes following the death of senator Edward Kennedy.
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