BBC News | World leaders gather for 'crucial' UN climate meeting BBC News World leaders including US President Barack Obama are holding a summit on climate change at the United Nations. The aim at the New York meeting is to galvanise member states to sign up to a comprehensive new global climate agreement at talks in Paris ... Climate Summit Opens as Leaders Attempt to Address Divide Over Warming Taoiseach praises Irish role in tackling climate change World's Top Polluters Skip United Nations' Climate Summit |