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。
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