Thermodynamically, it hardly makes a difference whether the security budget of a given monetary network is spent directly on proof of work or on return on capital securing this network, for energy consumption will inevitably occur as the owners of capital begin to consume the profits.
So switching to PoS does not reduce energy consumption if at least a similar level of security is to be maintained (secure PoS is just obfuscated PoW).
Do you want to really save energy?
Work and earn less, in order to be able to spend less.
Otherwise you only contribute to shifting energy consumption between industries, depending on what you prefer to spend your income on.