报告认为“扩大生物燃料的使用和生产对减少温室气体排放量所起的作用不一定像以前假设的那样。”
"Expanded use and production of biofuels will not necessarily contribute as much to reducing greenhouse gas emissions as was previously assumed," the report finds.
生物燃料影响温室气体排放的最重要因素是由土地使用变化来决定的。
The largest impact of biofuels on greenhouse gas emissions is determined by land-use change.
人们认为，用可再生的生物能源代替化石能源能够减少温室效应气体的排放，提高能源供给的安全性。
The use of renewable biofuels in lieu of fossil fuels is said to reduce greenhouse gas emissions and increase energy security (but see Carbon emissions).
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