The aviation industry wants to find an alternative to jet fuel, especially after getting burned by skyrocketing energy prices last summer. Continental Airlines is testing fuel made from the tropical shrub jatropha and algae, the first airline trial of algae and the first use of biofuels in a twin-engine jet. Air New Zealand flew a Boeing 747 last week with one of four engines running on a 50% biofuel mix. Specialists, however, say that the airlines must be careful not to seek alternative fuels that produce more carbon dioxide or compete for cropland, among other considerations.

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