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The warning comes as concern over the impact of climate change and the lack of urgent action is increasing, reflected in the Extinction Rebellion protests and schoolchildren's strikes across the world.

(The Guardian.)

1) Is as a subordinating conjunction or is it a preposition in the PP as concern over the impact of climate change and the lack of urgent action is increasing?

2) And if as is a preposition, is the PP as concern over the impact of climate change and the lack of urgent action is increasing a complement of the verb "comes" in the cited sentence?

3) Is reflected in the Extinction Rebellion protests and schoolchildren's strikes across the world a misattached (dangling?) non-finite clause or a supplement loosely attached to The warning comes as concern over the impact of climate change and the lack of urgent action is increasing?

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I can't pinpoint the implied subject (or an implied 'anchor') of the non-finite clause reflected in the Extinction Rebellion protests and schoolchildren's strikes across the world. Is it "concern", "the lack of urgent action", or "The warning"?

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"as" is a conjunction.

It is debatable whether the "reflected in ..." part is, strictly speaking, properly attached. However we understand it to be saying that the protests and strikes reflect the fact that concern is increasing.

Comments  

Thank you for the reply.