" Any carbon market inside china has the potential to be a game changer , " says david yarnold , the executive director of the environmental defense fund ( edf ) .

环境保护基金（edf）的执行董事davidyarnold表示：“中国国内任何一个碳交易市场都有成为游戏变革者的潜力。”

" There 's ample reason to be optimistic about efficiency generating enormous savings , " says david yarnold , executive director of environmental defense fund , a us-based non-profit environmental advocacy group .

总部位于美国的非盈利环保组织environmentaldefensefund执行董事戴维亚诺德（davidyarnold）表示：“我们有充分的理由相信，效率将带来巨大的节约。”