While all of the problems associated with global warming can initially be countered to some extent in some, most, or all places given enough capital outlay for technology, etc., the basic problem this article1 points out is that, at some point in time, if global temperatures continue to rise, there will eventually not be enough resources everywhere to handle things.
For example, the increasing incidence of malaria will eventually outcompete all of the public health management that society will be able to throw at it. Also, because humans, as well as all land animals, have limited behavioral and homeostatic mechanisms to handle higher and higher temperatures, there just won’t be enough resources to air condition every place, day and night, to preserve everyone’s lives.
Personally, I would rather pay for the large investment in technology to reduce the threat than to shovel our entire collective monetary futures into a futile ...