The basic reason why IPCC scenarios SSP5-8.5/RCP 8.5 are wrong is because they are based on a world population of 12 billion in 2100. Current estimates are that the world population will be around the current 8 billion in 2100. With China now losing population and having low fertility rates, they alone will probably lose ~750 million of their current 1.4 billion population. Many other countries are already losing population (South Korea, Japan, Russia, Italy, Spain, ... ).
With the population also rapidly aging worldwide due to low fertility rates, the use of energy per person will decrease, making that scenario even less relevant.
The basic reason why IPCC scenarios SSP5-8.5/RCP 8.5 are wrong is because they are based on a world population of 12 billion in 2100. Current estimates are that the world population will be around the current 8 billion in 2100. With China now losing population and having low fertility rates, they alone will probably lose ~750 million of their current 1.4 billion population. Many other countries are already losing population (South Korea, Japan, Russia, Italy, Spain, ... ).
With the population also rapidly aging worldwide due to low fertility rates, the use of energy per person will decrease, making that scenario even less relevant.