Living in an RV is substantially "greener" than living in a 4,000 square feet McMansion.
Beg to differ, sir. If you live in that McMansion but don't travel a lot then your gas consumption is considerably less and quite possibly in a far more fuel-efficient vehicle. Many new houses are extremely efficient when it comes to energy consumption. As to those jets-it's somewhat more complex with many variables, including fuel efficiency of vehicles compared as well as occupancy of both. But let's look at the larger picture.
How many trees have been cut down to make room for the campground you are staying in? It's no different than the development of land for a house. What about the roads that have to be made to get there? The wildlife that is disturbed in the process? Energy to heat bath houses, pools and other facilities? What about the materials used to construct the amenities such as play grounds? Do the materials used to construct an RV go back to nature like the wood in a house? How long does that RV last versus a house? I could go on but I think you get my drift. Part of the reason why some may feel living in a RV is much "greener" is they fail to realize many of the impacts the lifestyle has. Yes, maybe you only fill your water tank occasionally but if you are out exploring the water you didn't use in the RV to flush or get a drink is consumed elsewhere. Some of the issues of consumption are merely shifted, not done away with. Just sayin'.