For more than 30 years, investors have been looking for hydrogen stocks to buy as the pursuit of clean energy has gone from vision to reality. However, while hydrogen holds promise as one of the few “clean” energy alternatives, there are several obstacles that the industry has yet to fully overcome.  To begin with, producing hydrogen is expensive, particularly relative to traditional fossil fuels. There are also logistical concerns over storage and transportation, and public acceptance in many areas is lack ...