The sentence that best expresses a sense of urgency in a claim is In his doctoral thesis, A Bright Tomorrow?, Dr. Smith <u>insisted</u> that if we do not lower carbon emissions, the earth may be inhabitable by the year 2050.
<h3>What is a Claim?</h3>
This refers to the statement or assertion that is used to talk about a thing that may be true or false.
Hence, we can see that The sentence that best expresses a sense of urgency in a claim is In his doctoral thesis, A Bright Tomorrow?, Dr. Smith <u>insisted</u> that if we do not lower carbon emissions, the earth may be inhabitable by the year 2050.
Read more about claims here:
brainly.com/question/2748145
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