Copenhagen climate change conference in pictures: Day four

A man sells roses at a pedestrian road in central Copenhagen December 10, 2009. Photograph: Christian Charisius/guardian.co.uk

A person walks over stickers on the floor stating "Reduce Your Carbon Footprint" at the Bella Center Photograph: Adrian Dennis/guardian.co.uk

French photographer Yann Arthus-Bertrand hugs an activist dressed as a polar bear holding a sign urging the U.S. to stick to the safe limit of 350 parts per million CO2 in the atmosphere, at the main venue hall of the UN Climate Summit in Copenhagen, Thursday Dec. 10, 2009. Photograph: Peter Dejong/guardian.co.uk

American environmentalist and writer Bill McKibben poses at the main venue of the Climate Conference in Copenhagen, Thursday Dec. 10, 2009. Photograph: Peter Dejong/guardian.co.uk

Danish minister for Climate Change Conference Connie Hedegaard waits for delegation members of the todays meeting in the Plenary Tycho Brahe prior to the conference of the parties serving as the meeting of the parties to the Kyoto Protocol (CMP) on December 10, 2009 in the Bella Center. Photograph: Attila Kisbenedek/guardian.co.uk

A Tuvalu delegation member looks on after a meeting was adjourned in the Plenary Tycho Brahe serving as the meeting of the parties to the Kyoto Protocol (CMP) on December 10, 2009 in the Bella Center Photograph: Adrian Dennis/guardian.co.uk

Delegates at the UN Climate summit in Copenhagen, Denmark watch on a giant TV screen as U.S President Barack Obama accepts his Nobel Peace Prize in Oslo, Norway December 10, 2009. Photograph: Anja Niedringhaus/guardian.co.uk

People work with their laptops at the halls of the Bella Center Photograph: Christian Charisius/guardian.co.uk

An environmentalist holds a banner reading 'Countdown to CO2PENHAGEN Time for climate justice' during the fourth day Photograph: Miguel Villagran/guardian.co.uk

Chinese Vice-Minister for the National Population and Family Planning Commission Zhao Baige gives a lecture during her presentation on 'Population, Climate Change and Practicies in China' in the China Information and Communication Center on December 10, 2009 in the Bella Center Photograph: ATTILA KISBENEDEK/guardian.co.uk

A women walks the Bella Center with her placard following a small demonstration during the climate summit in Copenhagen on December 10, 2009. Photograph: Adrian Dennis/guardian.co.uk

Activists from Avaaz.org dressed as aliens roam the halls of the Bella Center Photograph: Bob Strong/guardian.co.uk

George Soros announces during a press conference a plan to generate additional 100 billion US dollars for climate change relief during the fourth day of the United Nations Climate Change Conference 2009. Photograph: Miguel Villagran/guardian.co.uk

Coordinator Mithika Mwenda, left, and committee member Augustine Njamnshi, right, call upon U.S. President Barack Obama to take action, at a press conference of the Pan African Climate Justice Alliance at the Climate Summit, December 10, 2009. Photograph: Peter Dejong/guardian.co.uk

American Kari Fulton, a leader in the U.S. youth climate movement cries as she delivers an emotional speech calling upon U.S. president Barack Obama to take action, at a press conference of the Pan African Climate Justice Alliance at the Climate Summit, December 10, 2009. Photograph: PETER DEJONG/guardian.co.uk

A woman delegate walks past members of an American youth group while they hold a demonstration in their underwear outside The Bella Centre as people arrive for the climate summit ahead of the fourth day of COP15 Climate Conference in Copenhagen on December 10, 2009. EU leaders hope to agree a multi-billion euro fund to help developing nations tackle global warming, and boost the faltering UN climate talks in Copenhagen. Photograph: Adrian Dennis/guardian.co.uk

Demonstrators hold banners drawing attention to the Children's Voices for Climate Justice inside the Bella Center Climate Conference venue on December 10, 2009. Rich and poor nations, the reluctant and the ambitious, press on behind closed doors and in open forums to bridge wide gaps and reach agreements on how to combat global warming. Photograph: PETER DEJONG/guardian.co.uk

Delegates pose beside the COP15 logo as they arrive at The Bella Centre for the climate summit ahead of the fourth day of COP15 Climate Conference in Copenhagen on December 10, 2009. Environment ministers sought to boost UN climate talks after the marathon meeting ran into turbulence, including a tough exchange between the United States and China. Photograph: Adrian Dennis/guardian.co.uk

Morning breaks at Copenhagen's North harbour. Photograph: Axel Schmidt/guardian.co.uk

Unidentified NGO delegates work during the UN Climate Change Conference, in the Bella Center Photograph: Liselotte Sabroe/guardian.co.uk

Crown Princess Mary of Denmark, left, addresses guest after attending a show of ethical and sustainable produced fashion by Nordic fashion designers during a show organized by the Danish fashion Institute in Copenhagen, December 9, 2009. The Nordic Initiative Clean and Ethical (NICE) has been established to motivate and assist companies in the Nordic fashion industry in becoming more sustainable. NICE is a groundbreaking collaboration that brings together the entire Nordic fashion industry around the shared goal of incorporating sustainable values, principles, and practices into the industry and making a difference globally. Photograph: Peter Dejong/guardian.co.uk

Models walk during the sustainable runway show organized by the Danish fashion Institute promoting responsible and ethical produced fashion on December 9, 2009 in Copenhagen. The Nordic Initiative Clean and Ethical (NICE) helps companies in the Nordic fashion industry in becoming more sustainable. Photograph: Miguel Villagran/guardian.co.uk

An unidentified NGO delegate takes a nap. Photograph: Liselotte Sabroe/guardian.co.uk

A delegate prepares to walk past a light installation as he exits the Bella Center Photograph: Adrian Dennis/guardian.co.uk