Greenpeace was one of the first parties to formulate a sustainable development scenario for climate change mitigation, which it did in 1993. According to sociologists Marc Mormont and Christine Dasnoy, Greenpeace played a significant role in raising public awareness of global warming in the 1990s. The organization has also focused on CFCs, because of both their global warming potential and their effect on the ozone layer. Greenpeace was one of the leading participants advocating early phase-out of ozone depleting substances in the Montreal Protocol. In the early 1990s, Greenpeace developed a CFC-free refrigerator technology, "Greenfreeze" for mass production together with the refrigerator industry. United Nations Environment Programme awarded Greenpeace for "outstanding contributions to the protection of the Earth's ozone layer" in 1997. In 2011 two-fifths of the world's total production of refrigerators were based on Greenfreeze technology, with over 600 million units in use.