Does not increase the amount of greenhouse gases in the atmosphere. Emission of hydrocarbons, carbon monoxide and nitrogen oxide are low. In concentrated form, it is explosive. Gas has to be compressed. Infrastructure is relatively well developed.
Many countries have access to it, and it is inexpensive.
Eliminates 20 percent more carbon dioxide than gas. Emissions of hydrocarbons, carbon monoxide and nitrogen are low. In concentrated form, it is explosive. Tank occupies large amount of space. Quiet operation and can be refueled at home or work.