Because increased demand for bio-fuels leads to cutting down carbon-rich forests, a 2008 Science study showed that the net effect of using them is not to cut CO2 emissions, but to double them. The rush towards bio-fuels has also strongly contributed to rising food prices, which have tipped another roughly 30 million people into starvation.
由于生物燃料需求增加导致砍伐大量吸收二氧化碳的森林，科学杂志2008年的一项研究表明使用生物燃料的净效益并不是减少二氧化碳的排放，而是让排放翻倍。一股风地发展生物燃料还极大地推动了食品价格的上涨，造成大约另外三千万人陷入饥饿。