Well the thing is that there are other countries and other countries may be disproportionately affected by climate change, for example: "Around the Mediterranea

Well the thing is that there are other countries and other countries may be disproportionately affected by climate change, for example: "Around the Mediterranean, freshwater availability will drop by almost twice as much at 2 degrees as at 1.5 — 17 percent versus 9 percent," or "But even getting up to 2 degrees, 'tropical regions like West Africa, South-East Asia, as well as Central and northern South America are projected to face substantial local yield reductions, particularly for wheat and maize.' https://www.vox.com/energy-and-environment/2018/1/19/16908402/global-warming-2-degrees-climate-change https://www.vox.com/energy-and-environment/2018/1/19/1690840... So, yeah, you might have more productive fisheries, but the cost is the death of millions of humans. There's also no true indication we will keep climate change within that 1.5 to 3.5c window, so it's unknowable what the true cost would be.