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On a like-for-like basis (eg: buying another i30) you still have to produce the new vehicle with the associated pollution output, etc. I believe the carbon footprint associated with manufacture is around 20% +-8%?
When you turn it up a notch & introduce the materials associated with battery production it's a step worse for the environment as a whole of life cycle proposition.
Australia has been buying 1million + new vehicles every year for the past 5(??) years. The average age of the fleet has dropped from 11 years in 1997 to 10 years, despite vehicles being made of better materials & better quality which implies they are being scrapped earlier.
While used vehicles do trickle-down through the system, I believe that due to the number of new vehicles entering the market every year, the lifespan of the used vehicles is shorter than it was because people can't sell them. Our group of friends all have kids that are starting to drive. 30 years back they would have bought the kids a 2nd hand car about 5-10 years old for a few thousand. These days, they look at a 2nd hand car for around $6,000 and an entry level new car for around $12k and stump up the cash for the new car (for multiple reasons). I think lots of used cars sit around waiting to be sold, then the rego runs out & they sit some more & then they get rust & eventually end up at the scrappers.
Sure, if you need a new car then buy one but I think trying to colour it as an environmental choice is probably only trying to help justify the purchase.
These links are just random things I googled. Maybe they are really inaccurate & BS but it's food for thought.
Better for the Environment: New Car or Keep the Old
Manufacturing a car creates as much carbon as driving it | Environment | The Guardian
403 - Forbidden
Your Car's Carbon Footprint: Hybrid vs. Gasoline vs. Electric Cars - WegoWise Blog
Environmental Impact | EVs might be more damaging than you think | Digital Trends
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I used to think I was anal-retentive until I started getting involved in car forums
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