Argument: Natural gas vehicles are commercially viable now
"Natural Gas Vehicles - A 'Now Solution' to Reducing Global Warming". IANGV 02 June 2003 - "The world-wide organization says vehicles using compressed natural gas (CNG) and liquefied natural gas (LNG) now total more than two million and are operating in more than 50 countries. "The natural gas vehicle industry is mature and commercially viable in many countries. More than 50 vehicle manufacturers are now producing factory-built natural gas vehicles," says the organisation’s New Zealand-based Secretary-General, Dr Garth Harris."