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globalchange

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total petroleum hydrocarbons(4)
carbon dioxide(3)
united states(3)
article(2)
average emission rate(2)
bohai bay(2)
bus transportation(2)
calibration(2)
carbon emission(2)
carbon footprint(2)
carbon monoxide(2)
catalyst(2)
combustion(2)
comparative study(2)
compressed natural gas(2)
compressed natural gasses (cng)(2)
controlled study(2)
diesel engines(2)
emission inventories(2)
emission inventory(2)
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