The author examined the environmental effects _ the economic effects were just as significant
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Based on the given sentence, it seems like there is a missing word or phrase that connects the two parts of the sentence. To determine the missing word or phrase, we can look for words or phrases that could logically complete the sentence and maintain the intended meaning.
In this case, the word "and" could be a suitable choice to connect the two parts of the sentence: "The author examined the environmental effects, and the economic effects were just as significant."
By adding the word "and," the sentence now clearly states that the author not only examined the environmental effects but also found the economic effects to be equally significant.