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Two people boarded the rig at the Skipavik yard on Norway's west coast Thursday morning and have requested a meeting with the rig's captain.
Another 10 activists are in the water with signs that say, "Same shit, new wrapping," in reference to Statoil, Norway's biggest petroleum company, that wants to change its name to "Equinor."
The protesters are there "to ensure the rig does not leave port," Truls Gulowsen, the head of Greenpeace in Norway, told Reuters.
"We are prepared to stay as long as necessary," he added.
Kayaktivists from Greenpeace Norway have boarded the oil rig West Hercules in a fjord off the west coast of Norway.Greenpeace
Statoil contracted the West Hercules semisubmersible rig set to drill two exploration wells in the Barents Sea this summer.
Earlier this year, Greenpeace and other groups lost a climate case against the Norwegian government for granting new oil drilling licenses in the Arctic ocean, claiming that such activity violates people's right to a healthy environment and breaches the Paris agreement.
An appeal was launched soon after. Greenpeace demands that Statoil suspend all drilling until a final verdict is reached.
"The amount of oil and gas that has already been found is more than the climate can withstand, so it is pointless and dangerous to look for more. Nevertheless, Statoil is preparing for a massive oil exploration operation in the Barents Sea," said Gulowsen in a statement.
Greenpeace has labeled Statoil's name-change as "greenwashing."
"Whatever they call themselves, oil will still stain their name if they continue to pursue drilling in the Barents Sea and are involved in several highly controversial oil projects around the world," said Gulowsen.
"They must cancel plans for exploration drilling at Korpfjell and Gjøkåsen over the summer, for the climate and environmental reasons, and also because the oil wells are subject to a legal challenge."
Statoil said the protest would not affect operations.
"There's a contract for upcoming work, but we haven't begun any operations yet in that regard. It's from this summer and onwards," spokesman Morten Eek told Reuters.
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Madagascar has embarked on its most ambitious tree-planting drive yet, aiming to plant 60 million trees in the coming months. The island nation celebrates 60 years of independence this year, and the start of the planting campaign on Jan. 19 marked one year since the inauguration of President Andry Rajoelina, who has promised to restore Madagascar's lost forests.