And then how do you provide energy cheaply and reliably enough? That is in order to maintain today’s “civilizational level”, so to speak.
As far as I am aware the energy sources that are now branded as alternative cannot do that, i.e. provide energy that is both cheap and reliable.
https://www.reuters.com/business/environment/australia-promi...
It's rather interesting that some major fossil fuel producers are building renewable domestic infrastructure (Australia, Saudi Arabia) although they don't seem to want to cut exports as quickly.
But the transition is not going to be instantaneous. If renewables are as cheaper/reliable/better as fossil fuel (and continually improving) the economic incentives will effectively push the transition as fast as is possible. The transition is supply constrained as much as anything. Production of solar, wind is rapidly growing, but it can only grow so quickly.