So, models describing the moisture content of forest fuels are an integral component of most fire behavior prediction systems.
所以建立数学模型是研究森林可燃物含水率变化规律的核心问题，也是最常用的方法。
Tropical forest trees are absorbing about 18% of the carbon dioxide added to the atmosphere each year from burning fossil fuels, substantially buffering the rate of change.
每年化石燃料燃烧产生并排放到大气中的碳排放，有18%被热带森林吸收了，大大减缓了碳排放的增加速率。
But by 2005, emissions from fossil fuels alone were 7.9 billion tonnes, with another 1.5 billion tonnes caused by forest clearing.
但到2005年，仅矿物质燃烧一项就造成七十九亿吨二氧化碳被排放，另外森林砍伐也产生十五亿吨。
But by 2005, emissions from fossil fuels alone were 7.9 billion tonnes, with another 1.5 billion tonnes caused by forest clearing.
但到2005年，仅矿物质燃烧一项就造成七十九亿吨二氧化碳被排放，另外森林砍伐也产生十五亿吨。
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