Given the razor thin margins of BTC the miners are heavily incented to use the cheapest energy possible. And as miners exploit cheaper energy they deploy more ASICs, raising difficulty and decreasing margins for the remainder. As such miners switch to economical power sources faster than perhaps any other industry and many operations have relocated accordingly

As of 2019, the absolute cheapest subsidy free energy in the world is Chilean solar power. In the next 5 years solar will indisputably become the cheapest if you consider the proliferation in China, Saudi Arabia's plans ect.

What is unique about mining vs almost everything else is that location is irrelevant. It doesn't need to be connected to any supply chain or residential areas. Accordingly we are seeing heavy investment to exploit areas that are very well suited to wind and solar but are hard to connect to the grid, meaning there is currently no demand even though there is potential supply. One such project is in Morocco

If BTC has merit as a network it will have staying power well past 10 years, at which point the carbon output should be null.