GMAT Sentence Correction (SC) | Re: Discussion of greenhouse effects have usually had as a focus the possi

Dear expert @mikemcgarry,
I chose correct choice and eliminated wrong options in the same way as in previous posts. I just had a minor concern that is "grow warmer" similar, in meaning, to "get warmer"? If not and depending on particular context, then could you please show us more? Thank you a lot.

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