In early January, the Oslo district court dismissed a first case by the Norwegian branch of Greenpeace and Natur og Ungdom (Nature and Youth) which had sued the government for granting exploration licenses in the Barents Sea in May 2016.
"It is crystal clear that the state is violating the Constitution and our right to a healthy environment by allocating new oil deposits," Natur og Ungdom leader Gaute Eiterjord said in a statement.
The environmentalists accuse Norway of violating a new article of the country's constitution that guarantees since 2014 the right to a healthy environment.
But the Oslo court said the state could not be held responsible for CO2 emissions caused by hydrocarbons which it exports to other countries.
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"There is already enough carbon dioxide in the atmosphere to seriously damage our future," Truls Gulowsen, head of Greenpeace in Norway, said in a statement.
"By opening up these pristine areas for oil exploration Norway is effectively smuggling its emissions outside of its own borders and furthering climate change, which harms everyone, everywhere," he added.
The NGOs argue that new oil activities in the fragile Arctic region would be contrary to the 2016 Paris climate accord, which seeks to limit average global warming to under two degrees Celsius (3.6 degrees Fahrenheit).
As oil production has been halved since 2000, Norway has turned its sights toward the far North: the Barents Sea holds 65 percent of the undiscovered reserves on the Norwegian continental shelf, according to the Norwegian Petroleum Directorate.
Latest surveys, however, have given disappointing results.
The Norwegian state in May 2016 granted exploration licenses in the Barents Sea, comprising of a currently unexplored area, to 13 companies, including it's national champion Statoil, US giants Chevron and ConocoPhillips, and Russia's Lukoil.
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