Switzerland's annual greenhouse gas emissions in 2017 were more than 11 percent lower than in 1990, despite the fact that the country's population rose by over 1.5 million during the same period. Per-capita greenhouse gas emissions stood at around 5.6 tonnes in 2017. Two of the main reasons for the reduction have been structural change in the economy, and more efficient buildings. As a member of the UN Framework Convention on Climate Change, Switzerland must report its greenhouse gas emissions on an annual basis and document them comprehensively in its National Inventory Report. INFRAS was commissioned by the Federal Office for the Environment to contribute to this report and to deliver traffic data.