The greenhouse effect happens when

when reagan refers to freedom in this passage, he uses repetition as a rhetorical device. repetition is when the same words or phrases are repeated few times to make an idea stronger and more unforgettable. in this case, when he talks about freedom, he starts the sentence whit this word followed by a verb in present simple and after an advantage of being free.

explanation:

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."