You didn't italicize anything. However, I can assume that <em>a three-act farce </em>is italicized, and if that is the case, then this is an appositive phrase.
"A three-act farce" is an appositive. It is not a clause as it lacks a verb.
An appositive is a noun or noun phrase that renames another noun right beside it. The appositive can be a short or long combination of words. The appositive tends to be placed between commas. In this particular case, "A three-act farce" is renaming the noun mentioned before: the PLAY. And it is separated from the rest of the sentence with commas.
yes because they are releasing big amounts of carbon in the air that cannot be adsorbed all at once due to the large amount of trees being used and the oceans plants being damaged
