It's so obvious I wonder why it isn't talked about more But is it obvious? Let's say that fusion becomes commercially viable and vast amounts of emission-free

It's so obvious I wonder why it isn't talked about more But is it obvious? Let's say that fusion becomes commercially viable and vast amounts of emission-free energy become available cheaply. Would reducing the usage of it still matter? I would say the driving factor is the side-effects of energy production by current methods, not the energy itself.