There are also outstanding questions related to the real - world efficiency gains of natural gas fuels and the life - cycle emissions they produce based on methane leakage in the production process. (scientificamerican.com)
My impression is that there is a lot of money going into hydrogen fuel cell powered vehicle research, but very little into research on sustainable production of liquid or gas fuel from wood. (ramblingsdc.net)
The natural gas fuel company had another rough month. (fool.com)