Saltwater-loving plants could open up half a million square miles of previously unusable territory for energy crops, helping settle the heated food-versus-fuel debate, which nearly derailed biofuel progress last year.via Wired Science
By increasing the world's irrigated acreage by 50 percent, saltwater crops could provide a no-guilt source of biomass for alt fuel makers.
After taking into account environmental protections and other factors, Glenn's report estimates that 480,000 square miles of unused land around the world could be used to grow a special set of salt-tolerant plants — halophytes. Glenn's team calculated that this could produce 1.5 billion barrels of oil equivalent per year. That's 35 percent of the United States' liquid fuel needs.
Halophytes thrive in saltwater. While salt damages most plants, these salt-loving plants actually use the saltwater to draw in fresh water. In essence, they make themselves saltier than the surrounding water, which, through osmosis, drives fresh water into the plant.
These plants are attractive candidates for both food and fuel because they have very high biomass and oil seed yields. The Science authors note that one leading halophyte-candidate, Salicornia bigelovii, produces 1.7 times more oil per acre than sunflowers, a common source of vegetable oil.