LA Times: Abel Garrido has just struck oil and he’s not happy about it. Using a tree branch, the weathered farmer probed the edge of a pond that his cattle use for drinking water and soon turned up the smelly black sludge that he says has killed much of his livestock and sickened his family. “I’ve lost 30 cows,” Garrido said. “I cut them open and their insides are black.” Paying the medical bills to treat his three children for skin cancer has cost him his meager …