Fossil is still 84% of world energy usage and rising, it will take at least 50 years to replace it, I would say a 100 in reality.
Wind and solar are about 4% of world energy, but also intermitent making the reality even lower.
There are roughly 430 nuclear power plants on Earth, we would need up to 10,000 to replace fossil depending on their output power, just the cables to wire them all up would be beyond our manufacturing output by multiple factors.
We are struggling to build interconnects just for normal grid renewable balancing networks.
50 million miles of HV cable just to meet climate goals.
Vastly reduce consumption is the only way....meanwhile AI wants it all.