^
There is such a wide range of how and where people live that it would be very hard to prove which lifestyle is 'greener'. If you lived in a small,well-insulated house that was built 50 years ago that may have passive solar,etc. and drove a sensible, fuel-efficient car for work/errands, I'd think that would be way 'greener' than driving 1000's of miles each year in an RV that got 6 mpg. Of course there is everything in between, so you can't generalize. Sure, getting out of the rat race is great but all the RVs, the transportation infrastructure, Amazon consumerism and all that wouldn't exist without millions who keep their noses to the grindstone.
I put 'unnecessary' in quotes for a reason because everyone will have a different view on that. Now that I'm retired and drive a gas guzzler, I sort of feel that I'm entitled because for 30 years I drove fuel-efficient vehicles. Back in the early '70s I was one of the younger, ecologically aware people that sneered at the older crowd who clung to their yacht-sized cars that averaged 12 mpg. Now, I realize that I was being hypocritical because it was a matter of degree....I still burned fossil fuel with all my 'unnecessary' travels exploring the country.
For people who espouse the green lifestyle, I think they need to have the courage of their convictions and be truly green. Ride bicycles, or walk, build everything from scratch,grow their own food, get away from things that use electricity (like computers...LOL) and not be driving all over the country in gas guzzlers.
How dull that would be for most folks, me included.
Cheers...