... for the health and welfare of communities around the world. While every region of the world will be affected, the poor and most vulnerable would be hit hardest.A 4°C world can, and must, be ... than the warmest months at the end of the 20th century. In regions such as the Mediterranean, North Africa, the Middle East, and the Tibetan plateau, almost all summer months are likely to be ... more this cen-tury and beyond.Turn Down The heaT: why a 4°C warmer worlD musT Be avoiDeDxviiiAs the scale and number of impacts grow with increasing global mean temperature, interactions between...