True ... but the real issue for me is unpredictability.
Our civilisation is built on the fact that over hundreds of years, we have sussed out the norms that occur. To give an example, farmers know roughly how much rainfall they can expect, what temperatures are going to be, soil pH and nutrient content, when to sow and when to harvest, when to start cutting grass for hay to feed animals in winter months, and so on.
When something unusual happens it is disruptive. When a hurricane dumps months worth of rainfall in a few days, the systems we have in place struggle to deal with it. When summers are unusually hot, reservoir levels suffer and grass for animal fodder is reduced. And so on.
Global warming shouldn't be seen as good or bad, beneficial or harmful. It should be seen as adding a disruptive influence on the global systems we have developed. Dealing with disruption and uncertainty costs us. And the economics suggests doing nothing will cost us more than trying to stop it.