Modified taxis and passenger buses are d

Modified taxis and passenger buses are displayed behind a mock biofuel pump in a Manila parking lot during a launching of public utility vehicles powered by alternative fuels, and initiative led by President Gloria Arroyo in Manila on June 16, 2008, in an attempt to ease the impact of rising petroluem prices in the world market. Various alternative fuel source are liquified petroleum gas (LPG), compressed natural gas (CNG) and biofuel. Environment Secretary Lito Atienza said aside from fuel saving advantage, alternative fuel reduce air pollution. AFP PHOTO/LUIS LIWANAG (Photo credit should read LUIS LIWANAG/AFP via Getty Images)