(L to R) Members of anty-poverty group Oxfam wearing masks of world leaders British Prime Minister Gordon Brown, French President Nicolas Sarkozy, US President Barack Obama, German Chancellor Angela Merkel and Spain's Jose Luiz Rodriguez Zapatero move paper money from an aid money box to a climate money box on November 5, 2009, in Barcelona. Some 180 countries hold climate talks during the Barcelona Climate Change Talks before December's Copenhagen conference tasked with tackling the threat of global warming.