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How much are willing to pay for this food? And how well do you like cabbage?
Given the validity of your opinions on physics, I very much doubt the accuracy or relevance of your observations of agriculture. The bloke who owns the fields around my house isn't a corporation. Right now they aren't all under crop because he leaves some to grow weeds for a year then turns pigs and sheep out to mulch them........
We strike a deal, as has been done between farmers and consumers since civilisation began. As for cabbage, thanks to modern (i.e. post-1200) farming methods, he doesn't grow the same crop in every field every year. In fact there are several other farms nearby and around the world willing to supply just about anything you can eat, but to save having to negotiate with all of them, I visit markets and shops, wherein knowledgeable traders have made what we call wholesale deals with such productive gentlefolk, and arranged to bring a veritable selection of foods to my attention. We exchange money for goods, pretty much as you do on your planet. If we move towards sustainability by reducing the population, I think the price of food will decrease and its availability will increase. And before you ask "who will work the land?" it's worth looking at a simple fact: 80% of the Ugandan population works on the land, which is fertile, well watered, and never frozen. There are always shortages of food in Uganda. About 2% of the UK population works on the land, some of which is fertile and well watered but much is prone to flood, drought, and freezing. The supermarket shelves are groaning under the weight of food. Modern farming uses machines, not people.
I mention cabbage because I think it might be difficult to get people to revert back to a traditional seasonal diet where certain fruits and vegetables aren't available year round. England wouldn't be as bad as Canada, but I don't think you'll be growing bananas or coffee. I suppose you could grow some fruits and vegetables in green houses, but that's expensive and has an energy cost. You'd need huge tariffs to prevent people from importing cheaper food.
For what it's worth, UK calorific intake has actually decreased since 1950, but the universal adoption of home insulation and central heatig has reduced our calorific demand even more. All my contemporaries remember being cold as children
Nearly all your calorific intake is used to maintain your body temperature. The quickest way to lose weight is to take mild exercise (just enough so you don't feel cold) in a serious wind chill. I can lose 6000 calories a day when crosscountry skiing, but walking the same track in the summer only burns 2500 - 3000.
It may sound inhuman to say such, but I believe that genocide is the only solution. We may lose some very valuable in the process. But, that's the only solution there is.