The world needs a new source of energy, an unspillable source.

What to produce from uncoltivated lands? Biofuel or food…?

The world’s population is about 6 billion that will become 12 billion by 2054 if the current rate of growth continues…

Is biofuels production from uncoltivated lands a solution?
In addition, there are so much lands where sugar cane production would eat more CO2 than the uncoltivated land…
Why does someone say it’s a problem?

Thanks