Agence France-Presse: China’s envoy to the world climate change talks in Copenhagen has criticised rich countries for failing to fulfil commitments to curb carbon emissions and provide aid to developing nations. The comments from the envoy, Yu Qingtai, came after another official said a Chinese government minister had been blocked several times from entering the venue for the marathon UN talks in the Danish capital. “You will find a huge gap if you make a comparison between their pledges and the …