In the 20th century, global temps rose by about 0.7 deg C, sea levels by about 17 cms. If there were any deleterious effects from this, they were wiped out many times by the advances in technology, by changes in population density and distribution, and by improvements in governments (especially in China, but elsewhere too).
It seems reasonable to expect that these the scale of these changes will be at least as great in this century - probably greater. This will completely overwhelm, whether for good or ill, any supposed harm caused by a few degrees of warming.
In other words, unless a catastrophe is really in the offing, and the IPCC says otherwise, then all our efforts should be aimed at increasing global trade and growth, thus lifting millions more out of poverty. Green policies which seek to prevent this - which is all of them - should be abandoned immediately.