In addition, Japan has more than 292,000 vehicles which run on natural gas, according to a Japanese vehicle inspection association.
Japan is also by far the leader in solar energy, last year accounting for more than 51 percent of world photovoltaic cell production in terms of electrical power measured in megawatts, according to the US-based specialized publication PV News.
Japan's Sharp was number one for the fifth year in the solar energy production at 27 percent of the world's photovoltaic production, with fellow Japanese firm Kyocera coming in second, according to the journal.
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