There is a difference between cost and consequences.
If you assume that:
- Climate Change is real and man-made, then the consequences (costs and other) of not swapping to non-Carbon emitting energy sources outweigh the current costs.
- Fossil fuels are finite, then the consequences (costs and other) of not swapping to "renewable" energy sources outweigh the current costs.
It is false economy to save a billion dollars now, only to have to pay a 10s of billions in a decade's time.
That said, the amount of reduction in energy consumption required should be achievable by improved energy efficiency.
Do most devices really need to use Watts of power in stand-by mode?
Take the cheap power packs that a lot of devices have these days.
My friend and I measured 3 in our house and found they used 10W each, even though the items they powered were turned off!
IMO, a good example of capturing waste energy is regenerative braking.
In vehicles above a certain weight, the additional weight of the system can be offset by a weight reduction in the main engine.
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