Hacker Cinema
No Blade of Grass
1970 · Film · 96 min
Directed by Cornel Wilde
AdventureScience FictionAction
A strange new virus has appeared, which only attacks strains of grasses such as wheat and rice, and the world is descending into famine and chaos. Architect John, along with his family and friends, is making his way from London to his brother's farm in northern England where there will hopefully be food and safety for all of them.
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We had the same thing being reported in the late 70's.
There was a travelling exhibit that visited my high school which was an analog computer - you could set your energy sources (coal, hydro, nuclear, solar) and see how long society could run before we re-entered the Dark Ages (literally - no more electric lights!). Thinking about it - the consumption side was likely a rising wave function which predicted steadily-increasing use of electricity.
This was around the time when the EPA's Energy Star program got started, and I suspect it did a lot to counter the increase in demand.
You can also look at the films of the 70's to get some of the zeitgeist of the era - "Soylent Green", "Silent Running", "No Blade of Grass", "Damnation Alley", and so on, all with the theme that the Earth no longer nourishes life.
A film was made of the book in 1970: No Blade of Grass.
http://www.imdb.com/title/tt0066154/