Shift to varied, rotating crops, less fertilizer
Rotating varied crops stops depletion of soil, hence requires less fossil-fuel based fertilizer.  
Immediately related elementsHow this works
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What should Obama do next? »What should Obama do next?
Energy Policy? »Energy Policy?
Shift towards renewable energy sources »Shift towards renewable energy sources
Shift to varied, rotating crops, less fertilizer
Government should not interfere »Government should not interfere
we already delt with this once before. »we already delt with this once before.
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