This BBC series (of 8 one hour episodes) shows how Britain had to increase farm output due to the cut off of food imports during WWII
Wartime Farm Christmas Special
About These Videos "Historian Ruth Goodman and archaeologists Alex Langlands and Peter Ginn face up to the challenges of the biggest revolution ever seen in the history of the British countryside as they turn Manor Farm back to how it was run in the Second World War. When Britain entered the war, two-thirds of all Britain's food was imported - and now it was under threat from a Nazi blockade. To save Britain from starvation, the nation's farmers were tasked with doubling food production in what Churchill called 'the frontline of freedom'."
I love learning about WWII, and I think there is so much to be learned from that time period that could be applied to solving our current issues with sustainability, overconsumption, and climate change!