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We human must know the effect of global warming

Us human must know the effect of global warming.

Which one is correct?
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It's "we", since it is a subject: "We (humans) must know the effect of global warming", and not " Us (humans) must know the effect of global warming."
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HMFindlayWe humans must know the effect of global warming

Us humans must know the effect of global warming.

Which one is correct?

The choice is determined by its function in the sentence. "WE humansmust know the effect" (Subject of the verb 'know')

"The effect of global warming on US humans is extreme" (object of the preposition 'of ;.

I hope this helps.
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Comments  
darn I forgotten to add the 's' lol sorry guys Emotion: smile
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See this:

Man: I quite agree but do you know, Graeme, some people think us Norfolk lads are country yokels. Just how bright do you think Norfolk people are?

Boy: well are very bright, some people may think they aren’t very quick on the uptake but they will, sort of, show you up if they can.

taken from http://www.EnglishForward.com/English/WritingDownTranscriptSomeone/cjdbb/Post.htm even though it sounds like the guy said we instead of us
Good catch!

The correct version is

Some people think (that) we Norfolk lads are country yokels.

I think the speaker confused this construction with a very similar one which takes the objective case. Emotion: smile

Some people [think/consider] us Norfolk lads (to be) country yokels.

CJ