Assume that global growth will continue as it has in the past, despite changing weather patterns, falling agricultural yields, and hundreds of millions of climate refugees upending geopolitics. Assume that temperature increase isn’t occurring faster than assumed in the 2007 IPCC (even though data indicates that it probably is). Assume that the lives of billions of the world’s poor don’t much matter because they don’t produce very much (so long as the average citizen of the world is ok, and by ok we mean consuming about as much as expected, we’re all ok). In that case, there is no need to act to reduce emissions. Now, go burn some coal!
It isn’t “sloppy, sentimental and self-righteous” to point out that those who don’t produce much output are still humans. And it isn’t particularly rigorous to look at your model of output and assume that everything will be as it’s always been despite climatic changes entirely unprecedented in recent geologic history.