You've highlighted enough drawbacks that I wouldn't cry if it was taken out.
With respect to global warming... global warming doesn't have a uniform effect. That's why "climate change" may be a better term. Making one part of the world hotter affects weather patterns, evaporation rates, ocean circulation patterns, etc., which can cause other parts of the globe to cool. It wouldn't correlate to highly polluted areas, but it would cause disruption all over. Some would benefit more than others, but it would be unpredictable.
In fact, some climatologists claim global warming could cause an ice age. There is an important circulating current in the North Atlantic. This current brings warm water from the Equator north along the African and European coasts. It pulls cold water deep into the ocean at the northern point, from where it moves southward. Melting ice caps could decrease the salinity of the northern water, which means it wouldn't sink, which means the conveyer would cease, and warm water would no longer move north from the Equator, leading to an ice age in Europe.
With respect to global warming... global warming doesn't have a uniform effect. That's why "climate change" may be a better term. Making one part of the world hotter affects weather patterns, evaporation rates, ocean circulation patterns, etc., which can cause other parts of the globe to cool. It wouldn't correlate to highly polluted areas, but it would cause disruption all over. Some would benefit more than others, but it would be unpredictable.
In fact, some climatologists claim global warming could cause an ice age. There is an important circulating current in the North Atlantic. This current brings warm water from the Equator north along the African and European coasts. It pulls cold water deep into the ocean at the northern point, from where it moves southward. Melting ice caps could decrease the salinity of the northern water, which means it wouldn't sink, which means the conveyer would cease, and warm water would no longer move north from the Equator, leading to an ice age in Europe.