The type of climate change we are creating will, not could but will, within a few decades change weather patterns throughout the world. This in turn will affect our crops and whether or not they grow. The corn in Kansas and the wheat in the wheat belt do not give a damn how comfortable you are nor whether manhattan gets flooded. We are looking at megadroughts; flooding, when it does rain-that too has a negative effect on crops; and migration of food growing areas northward.
Archaeological evidence shows what happens to civilizations when the weather changes beyond a certain point. Jared Diamond's book Collapse just scratches the surface of what happens when nature does it and gives warning of what will happen with the man made version.