article_snippet.sent: The study's lead author, Eric Kort of the University of Michigan, Ann Arbor, noted the study period predates the widespread use of hydraulic fracturing, known as fracking, near the hot spot.
article_snippet.sent: There's been so much attention on high-volume hydraulic fracturing, but we need to consider the industry as a whole.'
highlights_snippet.sent: Hotspot predates widespread fracking in the area .