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有這樣一句話，In what could be a historic moment in the struggle against climate change, the Environmental Protection Agency on Friday confirmed what most people have long suspected but had never been declared as a matter of federal law: carbon dioxide and other greenhouse gases constitute a danger to public health and welfare.

這句話In what could be a historic moment in the struggle against climate change里what是作什么用的呢？擔任什么成分呢？

謝謝了。

句中的 what 相當于 the time that 或 the process that。　　

what could be a historic moment in the struggle against climate change 用作介詞 in 的賓語；In what could be a historic moment in the struggle against climate change 在句中用作狀語，表示時間。　　

In what could be a historic moment in the struggle against climate change 的大意是：在與氣候變化作斗爭過程中的這一歷史性時刻。