It is physically impossible. Point blank.
The only way out of this mess is fusion, which is highly unlikely to ever be harnessed.
Energy-matter conversion rates/energy drain by this planet means we will require FF for the rest of our limited existence. Deal with it, babe.
You refuse to open your mind and adapt:
Paraguay, Uruguay, Costa Rica, Nicaragua, Albania, Iceland, Scotland and Norway are all above 90% operating on renewable energy. While these clearly don't represent a large % of the world's population, they are the tip of the trend. Many large nations, like the UK, Germany, France and even China are reaching 50% of their consumption from renewables.
I am a proponent of nuclear as a viable alternative energy source, even if the renewables crowd would call this heresy. I feel that more research should be funded to find ways to further process nuclear waste but even now it's a far better solution than coal.