I search harder than you do to prove me wrong — -believe me.
As I see it, a sustainable existence is possible with 1 bn people on the planet — -which happens to be the number before the industrial revolution.
As things are, over half of us live in cities, which by definition, are unsustainable.
We can certainly make all kinds of things from biomass, but the prime use of biomass is food, (and the space to grow it)
We can’t grow our food plus everything else we need — -that’s not just my doomsday thoughts, just physical laws.
Our use of fossil fuels is the tapping of several million years of fossilised sunlight and burning it all at once. Using biomass is consuming only what we grow in our own lifetimes, not several million lifetimes.
I strongly recommend you read:
Renewable energy without the hot air, by Prof David Mackay (FRS)
and take in one of his online lectures.