If you read old novels and pay attention to what people ate, it is evident that in some places people did not eat a lot of meat, but ate staggering amounts of food, including more dairy products than most of us consume now.
In other places, the meat consumption was enormous; well beyond what we would consider “normal” now.
It has been my impression, admittedly gained from reading those novels, that the nature of the local food supply largely determined what people ate.
So, for the UN to say “eat less meat” and also “eat local stuff” doesn’t square.
Also, I have noticed over the years that old country homes often have “summer kitchens”; usually a smallish, very open building just a few steps from the home itself. People had those because, in cooking foods to can, people used big cauldrons and burned a lot of fuel (almost always wood) to cook the stuff in, sterilize the jars and caps, etc. Obviously, it generated so much heat that people couldn’t tolerate doing that in their own houses, and had summer kitchens to avoid it.
I don’t think people quite realize that home energy consumption in the “old days” was a lot higher than it is now. That’s why so many houses and business buildings have been “retrofitted” to save energy. Single pane windows, loose construction and no insulation didn’t hurt a thing if you had steam heat with a big coal boiler going in the basement. If you have ever been in a house with so much as a wood cookstove, you would understand that as well. I remember my father telling me that when he was a kid, his mother’s cook stove heated the whole house, as well as cooked the food. That’s one of the reasons old houses have high ceilings and transoms over the doors. If you cooked at all, you had to let some of the heat go up and out of the house, even in the dead of winter. This is not all that cold a part of the country, but it’s still in the 40s and 50s most winter days, and you wouldn’t open transoms or windows to let heat out unless you simply had to.
There’s a lot to be said for home canning and cooking from basics, but saving energy isn’t one of them.