Lack of Arable land

I love to discuss the future of the world that my ALLSTARS will inherit with them. We talked about fossil fuels and alternative energies, in particular bio-fuels. I raised the point that if arable land was used to grow fuel, then food would have to compete with a tank of gas and food would lose. I invited the kids to find some solutions. 

Here are some very smart idea from Stav...