This article presents readers with the option of retaining three-wheeler taxis – with attention to better technology, maintenance and regulation – on the grounds that they perform a valuable role in the localities where they exist, and if they were removed the vehicles and travel practices that replaced them would produce increased congestion, road injuries and fatalities, air pollution and greenhouse gas (GHG) emissions. On these grounds, localities that do not have three-wheeler taxis might even consider introducing newer, cleaner-technology versions of them.

LNG consists mainly of methane, which has a boiling point of –164 ⁰C and for liquefaction requires cryogenic insulated tanks at about atmospheric pressure. Recent practice has been to liquefy the gas that is normally flared in oil fields in remote areas, but it can also be made from landfill gas when purified. LNG is about 1/614th the volume of natural gas at standard temperature and pressure, making it much more cost-efficient to transport over long distances, especially where pipelines do not exist. Similar to LPG, this portability is a major asset.