There are many past experiences to learn from at home and abroad; for instance, six World Heritage sites in China received yellow card warning at the Session of the World Heritage Committee held in 2010 mainly due to the change of ecological environment after overexploitation.
这方面中外都有前车之鉴，如在2010年世界遗产大会上，中国有6处世界遗产被黄牌警告，主要是过度开发导致遗产地生态环境发生变化。