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> For a given heat, a well insulated room is as comfortable as a badly insulated one - but with less energy input. A modern computer is as useful (more so) than a Pentium 4, but with less energy input. An LED bulb provides as much light as an incandescent, but with less energy input. When energy becomes expensive, it makes energy saving worthwhile, which makes the return on investment higher, which draws in R&D money.

You're right, and I think these are compelling examples. And climate change need not even be considered for these to support a carbon tax.

Thanks for the response.