一茶匙中子星上的物质重达十亿吨。
One teaspoonful of material from a neutron star would weigh a billion tonnes.
有关项目规模也太小，每年仅能削减3.3亿吨二氧化碳排放，而须削减的数量达数十亿吨。
It is also too small: it abates only 330m tonnes of CO2 per year, and billions of tonnes must be cut.
但是这没有什么值得庆祝的，因为冻土融化将释放几十亿吨的甲烷，温室气体的重要组成部分。
But that is nothing to celebrate, because melting permafrost will release billions of tonnes of methane, an especially potent greenhouse gas.
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