1. IPCC—SR15
http://www.ipcc.ch/report/sr15/
2. Summary for Policymakers of IPCC Special Report on Global Warming of 1.5 °C Approved by Governments: Press Release;Intergovernmental Panel on Climate Change (IPCC),2018
3. Paris Agreement on Climate Change, a Strong Call to Action for the Transport Sector
http://www.ppmc-transport.org/paris-agreement-on-climate-change-a-strong-call-to-action-for-the-transport-sector/
4. Inventory of U.S. Greenhouse Gas Emissions and Sinks (1990–2016);U.S. Environmental Protection Agency (EPA),2018
5. Fuel Economy;U.S. Environmental Protection Agency (EPA)