With the Copenhagen climate summit just days away, green issues were central to talks between the European Union and China today.At a meeting in the eastern Chinese city of Nanjing, Prime Minister Wen Jiabao said his country would deliver on a pledge to curb carbon dioxide output. The world’s top greenhouse gas emitter, China has vowed to cut its “carbon intensity” by 40 to 45 percent by 2020, compared with 2005 levels. But Wen also restated Beijing’s position that developed countries must lead the way in climate change talks by offering big cuts in their carbon emissions. As it prepares to host the summit, and celebrate Christmas, the Danish capital is setting an example. Santa Claus himself switched on the traditional lights in Copenhagen Town Hall square where pedal power is being used to illuminate the tree.