The rate of change over the last 40 years versus the rate of change over the previous 4 billion years
Equation for previous 4 Billion Years
The Anthropocene Equation for last 40 Years
A is astronomical forcing, G is geophysical forcing, I is internal dynamics of the Earth System, H is human activity.
The equation was developed in conjunction with Professor Will Steffen, a climate change expert and researcher at the Australian National University, and was published in the journal The Anthropocene Review.