What impact may global temperature change have on humans?

Q: What impact may global temperature change have on humans? A: I personally believe that this is a hidden thread in the development of human society. The visible thread is the lively political and economic interaction and technological roar, while the hidden thread is the physical basis for the profound shaping of our living environment by the expansion of population and civilization. The direction of this dark line is that as an external threat factor forcing changes in the distribution of power and resource endowments, carbon emission rights are an order spontaneously set up by developed economies to force other economies to obey. Furthermore, international mega rescue agencies (concentration of rights to fight natural disasters) and super agricultural companies (concentration of agricultural response capabilities) will come along with technological breakthroughs.