From Gianni Ortiz:
Actual scientific studies are few and far between, but what’s out there paints a pretty damning picture. One, titled “Livestock Poisoning from Oil Field Drilling Fluids, Muds and Additives,” appeared in the journal Veterinary & Human Toxicology in 1991. It examined seven instances where oil and gas wells had poisoned and/or killed livestock. In one such case, green liquid was found leaking from a tank near a gas well site. The study’s authors found 13 dead cows, whose “postmortem blood was chocolate-brown in color.” Poisoning cases involving carbon disulfide, turpentine, toluene, xylene, ethylene, and complex solvent mixtures “are frequently encountered,” the study concluded.