据估计，释放到大气中的甲烷有25%来自农场动物。
It is estimated that 25% of all methane that released into the atmosphere came from farm animals.
它异常巨大的彗核释放出大量的尘埃和气体——其彗核直径估计有18到25英里(30到40公里)——使它能够被肉眼清晰地看见。
Its unusually large nucleus gave off a great deal of dust and gas - estimated at roughly 18 to 25 miles (30 to 40 kilometers) across - appeared bright to the naked eye.
据世界卫生组织估计，使用这些燃料释放的温室气体，每年能导致150万人死亡——大多数是妇女和小孩。
The World Health Organization estimates that using those fuels, which also releases greenhouse gases, is responsible for 1.5 million deaths per year - most of them children and women.
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