I have been wanting to update their figure for some time, & see if their "laws" were correct.
rdcu.be/b4MOE
Around 1970 many technologies stop *fast* exponential growth, at quite different levels. I think this was a "crowding out" effect. Too many technologies fighting over the energy space for the given demand.
If fossil fuels are taken out of the energy system, there is more space for renewables to grow exponentially!
Take fossils out of the system, renewables will grow exponentially to fill the gap!
If anyone has better data sources back in time, let me know!
/end