It comes down to what each individual feels they want and can do to help reduce carbon. For some people it matters, for others it doesn't.
I have switched from driving my Tundra @ 15mpg to a Chevy @ 25mpg. But my reason is saving on my fuel costs. I really don't believe (or care) my reduction in carbon emissions will make a difference on climate change.
But for some people, I guess what I am doing is helping.

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