Capitalism is powerful because the government can create economic incentives to make the populace do just about anything. And we only need to conserve power until 2060 or so. That is when the whole fusion power thing kicks in and we just don't have to care anymore.
I do apreciate, Lord Xia, that you are progressively not caring about power usage. Such a futurist this guy.
In kind:
We only need to recycle metal until the first asteroid mining prison is built.
We only need to carpool until cars are replaced by maglevs and airshuttles.
We only need to reduce air polution and stop chopping forests until air recyclers can clean the air.
We only need to be at peace with China until we can build colonies in other systems.