premise: Cut off from world energy markets, the mountainous state of Armenia is making a virtue of adversity and may be leading the world in using cleaner car fuel, officials say.
  While the European Union is looking at 2020 before 10 percent of vehicles there will use alternative fuel, in Armenia up to 30 percent of cars already run on clean compressed gas, officials here say.
  This statistic includes about 45,000 private cars and 90 percent of public transport.
  
  Such high levels of clean fuel use are due "to the fact that Armenia, which has no energy resources of its own, is trying to use the most affordable alternative fuel," said Pavel Siradegian, a transport ministry official.
  In this the ex-Soviet republic appears be leading a trend. Around the world some five million vehicles are run on compressed natural gas and liquefied natural gas, according to the United States energy department's Internet site.
   What would cars in Armenia have to do if they could not run on clean compressed gas?
hypothesis: Cut off from world energy markets