求翻译：谈到温室气体排放，很有必要提及《京都议定书》。是什么意思？

About greenhouse gas emissions, it is necessary to mention the "Kyoto Protocol."

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Talks about the greenhouse gas emissions, has the necessity to mention "the Kyoto Protocol" very much.

When it comes to greenhouse gas emissions, it is necessary to mention the Kyoto Protocol.

Speak of greenhouse gas emissions, it is very necessary to mention Kyoto Protocol.