Encara no tenim significats per a "tar sands".
1Many European oil companies have major interests in the Canadian tar sands.
2Canadian officials have called development of the tar sands a national priority.
3Extracting tar sands also emits considerably more greenhouse gases than regular crude.
4Scientists have pointed to evidence that oil from tar sands is more polluting.
5They range from coal expansion in Asia to the tar sands of Canada.
6It's hard to grasp the enormity of the tar sands from the ground.
7And burning the additional tar sands oil would needlessly worsen climate change, Droitsch said.
8Oil from these nations is therefore sometimes dirtier than tar sands crude, it added.
9Environmental groups oppose Keystone XL, saying it would encourage more carbon-intensive tar sands development.
10The tar sands of northern Alberta are an international scandal.
11Facebook Twitter Pinterest Trucks carry raw tar sands near Fort McMurray in Alberta, Canada.
12And that's why tar sands have emerged as real battles.
13However, he added bluntly: Oil extraction from tar sands is polluting, destructive, expensive and energy-intensive.
14Canada has repeatedly raised the tar sands issue as a potential threat to trade ties.
15The pipeline extension would carry tar sands oil from Canada to the Gulf of Mexico.
16Shell has been working with Tatneft to produce tar sands crude in the Russian Federation.
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Tar sands a través del temps
Tar sands per variant geogràfica