参加论坛的17国对80%的温室气体排放负有责任。
The 17 countries in the forum are responsible for 80% of greenhouse gas emissions.
因此寄希望一个由193个国家组成的论坛去达成单一的一揽子协议，解决所有的气体排放源的问题，这是一种难以实现的愿望。
Trying to deal with all the sources of the many gases involved in a single set of negotiations, in a forum of 193 countries, was always a tall order.
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