Indeed they can. I just saw in the news section that General Hydrogen are going to sell 100 fuel cell units for forklifts commercially now. I don´t think they would risk producing a hundred FC-units without the firm knowledge that they will be able to sell them..

About the "cleanness" of hydrogen as a fuel: Yes, it is totally right that if you would be producing hydrogen let´s say by burning coal there would not be any environmental benefits made at all. Hydrogen is just a carrier of energy. There is a short term and long term perspective to this. The long term perspective is that the hydrogen should be produced from renewable energy sources like windmills or solar cells. The short term perspective is that we might have to begin with using existing sources of hydrogen like reforming it from natural gas for example. This gives us the opportunity to a choice of "switching track" further ahead into using renewable energy sources and thus reducing/eliminating the greenhouse gas problem and stop using nuclear power who´s waste products no one wants on their backyard. If we don´t begin using fuel cells we will not have that choice. Using hydrogen also gives us the opportunity to get away from having to adjust the energy output according to the damand depending on the time of day/year. I think General Hydrogen has made a good explanation of the hydrogen concept here. Check especially #4. http://www.generalhydrogen.com/tech_hydrogenmyths.shtml