Reuters reports that a group of British scientists is recommending an aggressive shift towards the planting of crops not for food, but for a wholesale replacement of petrochemicals. The combination of declining supplies of petroleum (used for much more than fuel) and a still-growing global population means that replacements will be needed soon -- and it's better to start planning now for that event than to wait until oil (effectively) runs out. "At a news conference, [plant reseracher Alison Smith] complained that in the past there had been a lack of coherent thinking, but that was now changing in the face of the looming crisis."
There should also be a corresponding shift in fertilizer technology; much of today's fertilizers are dependent on petrochemicals.
What might be more effective in the interim is approaching effectiveness of current crops; what happens to non-edible by-products of our existing crops? If they're not being used as sileage and green compost...??
worldchanging was founded on the idea that real solutions already exist for building the future we want. it's just a matter of grabbing hold and getting moving.