(First published on The Farming Show June 2012)
A maths lesson might seem an odd way to start a column on sustainable farming, but bear with me for a second.
We’re all familiar with the idea of exponential growth: it’s the function that drives compound interest, economic growth and population size. Those hockey-stick graphs that shoot upwards ever steeper are just the exponential function on paper.
Any system that repeats percentage growth qualifies as exponential. It doesn’t stop for a breather: it’s a percentage increase year on year that uses the previous year’s total in its calculation for the next.
In farming and food production terms, we all know that we’ll face the global problem of infinite growth on a finite planet eventually, as we hit the ceiling of food production and input resources.