Billions will die. The human population will crash. We are in overshoot, and the planet cannot sustain us in our current numbers or lifestyle.
— unenlightened
This is not what the science shows. There are no meaningful models that predict the human response to the climate change as it occurs, as if to suggest you can know what mitigating responses will be available. — Hanover
Of course it is not what the science shows. Science models, and models predict, However, the common sense prediction that humans would respond to the predictions in such a way as to mitigate the effects has proven false. On the contrary, net emissions are still increasing.
And there are other factors that seem to indicate that the climate sensitivity has been somewhat underestimated. Turns out that science can be a bit wrong the 'other' way too. It is becoming clear that actual temperatures have exceeded models by some margin, and so models need to be adjusted.
However, the main problem is the time lag. The Greenhouse effect of CO2 is that it insulates, and the effects of insulation are slow, and cumulative. In geological terms, our increase of CO2 levels in the atmosphere has been catastrophically fast, but in terms of human lifetime, the change in my seventy years lifetime has been barely noticeable.
This year we hit 1.5°C which was the recommended limit to prevent serious disruption to human life. So we have missed that target, and will almost certainly miss the 2°C target, because of the time lag of centuries and the fact that we have not even begun to reduce emissions, let alone reached net zero.
And we are already seeing disruption to agriculture, climate refugees, fighting over resources, depletion of natural resources especially forest, and the oceans, the best carbon absorbers.
But it's only just begun.
If it was just polar bears, I wouldn't mind much either, because I don't eat them anyway. But it is the whole ecosystem of the world that is being disrupted, and almost every species of plant and animal that is in decline. Your dinner plate may not be affected at first, because The US is wealthy and has a food surplus. Russia will do well because vast tracts of marginal land in the North will increase in value.
I will just repeat this;
All our worldwide human efforts at mitigation thus far have not added up to any reduction at all in net carbon emissions, but on the contrary, they are still increasing.
And if we do begin to reduce, and eventually reach zero, we will only have stopped ourselves from making things worse, but the insulating effect will continue to warm the planet for many many years to come.
There is no natural moral ought about this, as you point out. There is no natural ought about human survival, either. It is just a personal bias I have, such that I regret and mourn the folly of my species.