[IG_Semmelweiss]

You failed to add the two most important things on the subject about its impact worldwide

1) Certain regions, particularly those riding the equatorial line that also have wet seasons will experience (rather, are experiencing right now) extreme wet seasons with heavy flooding , for example in south america, such as Peru, Brazil and COlombia. The wet season causes an extreme cascading effect in those societies by the spike in cases of water-related (mosquito larvae) disease like dengue, cholera and malaria.

2) The same countries will experience drought in the normally quieter, "winter" season. That wrecks agricultural yield. Watch the price of bananas and similar water-intensive perennials , at your local supermarket early next year. For countries near major river flows (amazon in particular) that are not diversified in power sources and heavily dependant in hydro for power , they can get really in trouble and experience brownouts further damaging their GDP. This is rarer since most countries learn their lesson after the 1-brownout in a decade..but you never know.