A recent study by the Union of Concerned Scientists (http://www.ucsusa.org/sites/default/files/attach/2015/11/Cleaner-Cars-from-Cradle-to-Grave-full-report.pdf) describes the "Cradle to Grave" carbon emissions for battery-electric cars and shows that they are twice as good as conventional cars. This link goes to a pdf document that you can download. A more readable summary of this is found in a Green Car Reports article (http://www.greencarreports.com/news/1102307_once-again-electric-cars-have-lower-lifetime-carbon-emissions?fbfanpage).
For those of us who are pro-electric-car proponents, this information might be useful when your friends ask questions about carbon emissions.
As those of us who own or are leasing a BMW i3, we also know that the car contains recycled and sustainable material.
Here's a link to BMW that gives you more information about sustainability in the i Family: http://www.bmw.com/com/en/insights/corporation/bmwi/sustainability.html .
Another interesting article describes the manufacturing process used when a BMW i3 is created: http://www.compositesworld.com/articles/bmw-leipzig-the-epicenter-of-i3-production-