... the U.S. military, a slew of airline companies, Boeing and others have invested heavily in jet fuel made from plants—the oils provided by weedy camelina or hardy jatropha shrubs or even algae. The fuels have successfully passed all trials—even delivering more thrust per gallon—and have now entered regular commercial use in the U.S. and Europe, promising to cut CO2 emissions by 80 percent, albeit at a premium price. The U.S. Federal Aviation Administration is giving out $7.7 million in contracts to such jet biofuel–makers.