The phase-out of ozone depleting substances through the Montreal Protocol, for instance, shows what can be done when the international community works together. Thanks to the protocol, it is estimated that up to 20 million cases of skin cancer, and 130 million eye cataracts, will be avoided.
例如，通过《蒙特利尔协议》逐步淘汰破坏大气臭氧层的物质就显示了国际社会同心协力的作用。据估计，该协议的签定会减少2000万皮肤癌和1.3亿白内障病例。