The author states that there is a dearth of systematic empirical investigation into which one of the following?

Tonya-Kendall-2 on May 17, 2020

Where is this answer explicitly stated.

Can you please direct me to where this answer choice is explicitly stated ( 5he question references “stated”) in the passage? I found where it said the systematical evidence was lacking but did not find any other mention of evidence. Thank you.

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Tonya-Kendall-2 on July 15, 2020

Thanks Mike. I will let you know.

Emil-Kunkin on September 29, 2022

Hi, we are explicitly told that there is not enough study of the degree to which harmful pollutants cross borders in violation of international conventional norms. A, while somewhat abstract, reflects this.