What a fascinating thread!
I remember once hearing that the navy beans that go into a well known brand of baked beans are only grown around the Great Lakes area of North America. A discount supermarket I often use sources their own brand baked beans from Italy. There must be a vast area under cultivation at any one time, dedicated to growing beans destined for canning.
On occasions I have asked myself the following questions, or variants... how much area of land is required to grow all the beans that are sold in a year as baked beans in the UK? , or alternatively how much area of land was required to grow all the beans that are on sale now as baked beans in this supermarket? (or even in this one tin?) Your thread gives some figures that would certainly be a starter for ten.
There are ancestors to the humble British-style baked bean all over European and Middle Eastern cuisine. You can see some examples here
http://ozlemsturkishtable.com/2012/...-peppers-and-tomatoes-etli-kuru-fasulye-more/ and I have frequently had the pleasure of eating such food. Its easily available in Harringay, North London... you certainly dont need to go to Turkey.
Im sure that there are even people who dont realise that the beans they are eating were actually once a part of a plant!!