Posted By Sanford Nowlin on Mon, Dec 21, 2020 at 1:36 PM click to enlarge Wikimedia Commons / Library of Congress Valero s Port Arthur refinery San Antonio-based Valero Energy Corp., one of nation s largest refiners, ranks among the oil and gas industry s worst emitters of greenhouse gases, according to a new analysis of federal data. Valero s 14 production facilities including several in Texas released a total of 23.5 million tons of carbon emissions 2019, the Environmental Integrity Project reports, citing data from the Environmental Protection Agency and the Energy Information Administration. That puts the independent refiner ahead of fossil fuel heavyweights such as BP America Inc., Shell Petroleum Inc. and Koch Industrie