The international relationship between energy use (1,000 million tones of oil equivalent) and GDP (million US dollars, 1998) (WRI, 2002; from Cleveland, 2003). From my blog series at "A Global Organic Mindset": http://eddiemill.wordpress.com/
Now I don't have the graph (yet), but. I imagine this exact same thing to hold true with agriculture and yields. However, what the correlation doesn't account for is how to increase at the bottom end of the spectrum without making the same mistakes that those of high yielding (or high production) have made.
-EM

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