The amount of gas used means that a barrel of Californian heavy oil gives the stuff from Canada's tar sands a run for its money in terms of associated greenhouse-gas emissions.
根据相关的温室气体排放，天然气的耗费量意味着每桶加州重油竭尽全力从加拿大沥青砂岩中提取材料。
It takes up to four barrels of water to generate one barrel of tar-sands crude, and 20% of Canada's natural gas (a clean fuel) is used to produce oil (a dirty one).
每采集一桶焦油沙原油需要耗费四桶水。加拿大20%的天然气（清洁燃料）用来提炼石油（脏的原油） 。
It takes up to four barrels of water to generate one barrel of tar-sands crude, and 20% of Canada's natural gas (a clean fuel) is used to produce oil (a dirty one).
每采集一桶焦油沙原油需要耗费四桶水。加拿大20%的天然气（清洁燃料）用来提炼石油（脏的原油） 。
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