题目内容
Environmentalists are concerned about loss of biodiversity that will result from ______ of the forest.
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Cellulosic ethanol can also be made from wood residues, _______ solid waste such as trash or garbage, paper and grasses.
The reduction in green house gas emissions from corn ethanol and cellulosic ethanol ______ with fossil fuels is drastic.
Cellulosic ethanol is a biofuel produced from wood, grasses, or the ______ parts of plants.
Controversy and concerns relate to the large amount of ______ land required for crops and its impact on grain supply.
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