We have crossed over into the period where renewable energy sources and related required infrastructure is on par or cheaper than fossil fuels.
It is now just a matter of capital costs replacing old infrastructure with new while ramping up the industries that provide the replacements.
Inefficiencies scale with ramp up speed, but if you increase the cost of fossil fuels those inefficiencies are more competitive so you get a faster ramp-up.
The greater the cost the more conservation makes business sense.
If an efficient fridge is only 15$/month cheaper it's not replacing your current fridge. At 50$/month it quickly pays off.