In 1991 Professor Vellinga published an article with Robert Swart that became a cornerstone in the definition of the 2 °C target , than adopted by UNFCCC COP 15 in Copenhagen in 2009 . This article also proposed for the first time a traffic-light visualization - based on red , yellow , green colours - that since then has been largely employed in risk management and climate change communication . In 1991/1992 he was one of the architects of the United Nations Framework Convention on Climate Change and in 1989 was actively involved in setting up the Intergovernmental Panel on Climate Change ( IPCC ) as vice chairman in its first bureau . He was as an author of various IPCC chapters ( the work of the IPCC , including the contributions of many scientists , was recognised by the joint award of the 2007 Nobel Peace Prize )
2007 Nobel Peace Prize
2007 Nobel Peace Prize
Pier Vellinga