[1] https://www.epa.gov/greenvehicles/greenhouse-gas-emissions-typical-passenger-vehicle
[2] http://www.healthdata.org/news-release/state-global-air-2019-report
[3] https://www.who.int/airpollution/en/
[4] http://greenyatra.org/plantatree/offset.php
[5] https://www.epa.gov/greenvehicles/greenhouse-gas-emissions-typical-passenger-vehicle
[6] https://about.bnef.com/blog/cumulative-global-ev-sales-hit-4-million/