在一些最贫困国家，很多“可再生”能源是通过燃烧木材和其他生物质产生的，用途也只是取暖和烹饪。这些国家的能源利用，“既不环境友好，效率也不高。”
Much "renewable" energy was generated by burning wood and other biomass for heating and cooking in the poorest countries - energy use that is "neither environmentally friendly nor efficient".
使用催化剂是一种可以提高小分子可燃气体品位、提高生物质利用效率、减少焦油产生的经济可行的办法。
Using catalyst is an available and economic method to improve the quality of small-molecule combustible gas, increase the biomass utilization efficiency and decrease the tar yield.
中等供水处理扦插苗在水分利用效率、苗木生长及生物量方面，显著高于淹水和干旱胁迫处理。
On water use efficiency, growth and biomass accumulation of seedlings, the seedlings under intermediate water supply treatment are better than those of flooding and drought treatment.
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