1. Creutzig, F. et al. Transport: a roadblock to climate change mitigation? Science 350, 911–912 (2015).
2. Energy Technology Perspectives 2015: Mobilising Innovation to Accelerate Climate Action (International Energy Agency, 2015).
3. Clarke, L. et al. in Climate Change 2014: Mitigation of Climate Change. IPCC Working Group III Contribution to AR5 Ch. 6 (IPCC, 2014).
4. Global EV Outlook 2017 (International Energy Agency, 2017).
5. Vaughan, A. Electric and plug-in hybrid cars whiz past 3m mark worldwide. The Guardian (25 December 2017);
https://www.theguardian.com/environment/2017/dec/25/electric-and-plug-in-hybrid-cars-3m-worldwide