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Corn as a source for ethanol has its problems. While there are a number of backers, there are real issues that need to be addressed, including (but not necessarily limited to) the huge amount of corn required to brew large batches of the alcohol fuel and the large quantities of water needed in the process. A new alternative is just now popping up that may offer at least a partial solution: watermelon juice.

Ok, we know that technically any plant product can be made into ethanol. But the list of plant biomass that researchers are actively working on converting to ethanol is getting pretty long as well. We have the obvious ones - corn and soybeans - but also poplar trees, grapes, citrus fruit and now, watermelons.