The entire framing of the climate issue as "poor and middle class people need to use less energy, says a bunch of comparatively rich people living in high cost of living first world cities" guarantees political failure.
The only way we will get real traction against this problem is if we stop framing it around shame and austerity and instead frame it as a problem solvable via technological innovation that also frees us from the constraints of fossil fuel dependence.
That framing is also more correct IMHO, as there are numerous reasons to get off fossil fuels other than climate. The most significant of these is political independence and the fact that fossil fuels are a strictly limited declining resource whose depletion threatens our civilization on the supply side.
This is a technical problem not a moral problem. There is no god that is going to punish us for emitting carbon. It's just physics: more carbon, more retained solar heat, weather changes that will disrupt the food supply and threaten a bunch of major population centers.
It's also a problem about human self-interest not saving some mythical shibboleth of "unspoiled nature." Nature just is and we are only spoiling it for ourselves. As George Carlin put it: "Stop saying save the Earth! The Earth will be fine. We're fucked."
Edit: on a final note: yes it is true that we could probably absorb and adapt to even severe climate change. But the cost of non-carbon-based energy is falling rapidly as technology advances and renewable energy is scaled up, while the deferred cost of climate change is rising. These lines almost certainly intersected some time ago. Getting off fossil carbon is cheaper than continuing to make climate change worse. This effect is compounded by the fact that fossil fuels are being depleted and therefore that the more we invest in them the more fossil fuel infrastructure investment will eventually be stranded as worthless. That depletion will probably bite at about the same time as climate change, draining the economy right when that cost hits. When you consider the depletion and stranded investment angles getting off fossil fuels is probably many orders of magnitude cheaper than the alternative path.