The state’s largest utility is going green this Earth Day. OG&E pledges to replace light-duty vehicles, known as LDVs, entirely with electric vehicles.LDVs include sedans and the half-ton pickups you see everywhere. OG&E intends to focus on electric vehicles and charging stations. The utility is also pledging to reduce carbon dioxide emissions by 60% by 2030. “Transportation in America is the largest source of CO2 emissions. We want to do our part, not only on Earth Day but every day,” said OG&E’s Gayle Maxwell. As for the increased number of charging stations, she said: The more we give access, the more we see the emissions reduced more and more.”