The issue with bio fuel is the following: Due to climate change the overall area for food production in the world is shrinking. Bio fuel is directly competing with food.

The solution: Ditch carbon based fuels as much as possible and replace it with electric transport.

I know that it's currently unviable to use electric aircraft in almost all use cases except short range drones. But then the solution to that problem is to rely less on air travel and transport and use land based alternatives.

This is about vectors and incentives. Investing in bio fuels to get a 100% replacement for fossil fuels is not going to work and it only stalls what actually needs to happen which is a radical transport system change.