I don’t quite remember where I read that, but a point was made a while ago that it was better to buy a ten year old used car than the latest “eco-friendly” model. The reason is: for most cars (and I imagine this to be true for appliances), the peak point of pollution (any kind) is when they are made. It’s only if you use them extensively (while maintaining them) that you can offset this - I think for cars it was around 20 years.
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