The following achievements stand as examples for what humanity is capable of when the end result benefits both the self and the other. In other words, they are examples of when nations decided to cooperate with each other for self-interested reasons, yet still produced results that benefited the rest of humanity. In 1985, a group of British scientists warned the world that the use of chlorofluorocarbons (CFCs) was wreaking havoc on the ozone layer. A treaty known as the Montreal Protocol was drawn up, and for the first time in history, it was universally ratified (197 countries have signed on to date). As a result, the world successfully phased out 99% of ozone-depleting chemicals. If this hadn't been created, the Earth's ozone layer would have collapsed by 2050. The Human Genome Project was an international effort to map out the DNA sequence of the entire human genome. The knowledge gained from the project has led to better treatment, detection and prevention of human disease. It has opened doors to a greater understanding of the code that determines so much of our lives, and has provided key clues for further unraveling the human mystery. The International Space Station is, of course, a classic example of global collaboration in pursuit of knowledge and discovery. Research at the ISS has resulted in everything from the creation of advanced water filtration systems, to developing drugs for muscular dystrophy, to robotics used in surgery, to the development of better vaccines.