The annual greenhouse gas emissions in Switzerland were around ten percent lower in 2015 than in the year 1990. And this despite the fact that the population grew by nearly 1.5 million inhabitants during the same period of time. Among the main reasons are the structural change in the economy, modern vehicle fleets and energy-efficient buildings. Being a member state of the United Nations Framework Convention on Climate Change (UNFCCC), Switzerland has committed to the annual reporting on its greenhouse gas emissions. On behalf of the Federal Office for the Environment (FOEN), INFRAS has been involved as a co-author of the corresponding report: Switzerland's National Inventory Report (NIR).