Because China is the second largest country by land area, and the most populous country in the world (over1.35 billion), if its leaders and people could learn to follow rules, to develop compassion, and not to be greedy, not to destroy environment and exploit other peoples, the whole world would certainly enjoy peace and happiness.
Source:
https://search.yahoo.com/yhs/search?p=dalai+lama+world+ethics+you+tube&ei=UTF-8&hspart=mozilla&hsimp=yhs-001
