By Paul Beckwith
Push something and it moves a little. Push it a little more and it moves a little more. This is called a “linearity” response. But sometimes a little push can lead to something totally unexpected! This is called “nonlinearity” and, contrary to what one might think, nonlinearities are inherent in most systems - like our atmosphere, for example. In fact, abrupt and unexpected change happens at some point in most systems - we even have a saying for such unexpected outcomes: a tipping point.
Until recently, our atmosphere and oceans behaved like linear systems: incremental dumping of greenhouse gases into the atmosphere caused incremental changes, like rising temperatures and predictable rates of ice melt. But things are now changing unexpectedly fast – nonlinearity is kicking in! We only have to look at the rapidly vanishing arctic icecap for astonishing evidence.