For example, a biotech expert at North Carolina State University has developed a "transgenic tree" with half the lignin of its natural counterpart, allowing more efficient conversion of cellulose into biofuel. But whether this may trigger another ecological crisis has yet to be assessed.
又如，美國北卡羅萊納州生技專家已培育出一種木質素比天然樹木少一半的「基因轉殖樹」，可使纖維素轉變成生質燃料的過程更有效率，但是否會引發其他生態危機，也需要審慎評估。