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Carbon footprint of making the battery is indeed higher than making ICE. But over the car's lifetime, carbon footprint of EV has been consistently proven to be lower than ICE cars. There's no denying that lifetime carbon footprint is more important than one small part of a car's life.There is loads of info out there about the costs & carbon foot prints of making the batteries for EV's so it's not false info, ok you like your Nissan Leaf but in a way you are trying to tell everyone that they should switch over to an EV but there are down sides to them & as a time served mechanic I know first hand how bad the build quality of Nissan's are due to working on them & also from owning 2.
Whereas here are the articles (with multiple references in each link) that say EV lifetime carbon emissions is much lower than ICE cars:
https://en.wikipedia.org/wiki/Environmental_aspects_of_the_electric_car
https://www.nextgreencar.com/electric-cars/environmental-benefits/
https://www.eea.europa.eu/signals/signals-2017/infographics/range-of-life-cycle-co2/view
https://www.ucsusa.org/clean-vehicles/electric-vehicles/life-cycle-ev-emissions
Not surprised about Nissan build quality. They are like the worst Japanese brand. Here's an example:
https://www.speakev.com/threads/front-strut-top-bearing-failure.135124/page-2#post-2544120
But it's unrelated to the EV/petrol/diesel discussion, every brand of cars have its random quirks. Tesla Model 3 lets water run into the boot when opened. Mercedes engine had black death problem, VAG waterpump are known to fail, VW DQ200 and Ford dry-clutch gearboxes are known develop problems, etc.