In 2014, former Dept. of Energy official Joseph Romm wrote three articles stating that FCVs still had not overcome the following issues: high cost of the vehicles, high fueling cost, and a lack of fuel-delivery infrastructure. He stated: "It would take several miracles to overcome all of those problems simultaneously in the coming decades." Moreover, he said, "FCVs aren't green" because of escaping methane during natural gas extraction and during the production of hydrogen, 95% which is produced using the steam reforming process. He concluded that renewable energy cannot economically be used to make hydrogen for an FCV fleet "either now or in the future." GreenTech Media's analyst reached similar conclusions in 2014. In 2015, "Clean Technica" listed some of the disadvantages of hydrogen fuel cell vehicles as did "Car Throttle". Another "Clean Technica" writer concluded, "while hydrogen may have a part to play in the world of energy storage (especially seasonal storage), it looks like a dead end when it comes to mainstream vehicles."