Greenpeace blocked an oil drilling ship in the North Sea with swimmers and speedboats a day after a court ordered protesters to unchain themselves from the vessel, the group said Monday.

Activists for the environmental group had boarded the Stena Carron ship operated by Chevron and anchored off the Shetland Isles last week, but the oil giant won a legal ruling ordering them to leave on Saturday.

Greenpeace said in a statement on its website that it had sent inflatable speedboats into the path of the ship on Sunday and put four swimmers in its path, forcing the Stena Carron to stop.

"We're now planning to send waves of swimmers and campaigners in kayaks out in front of the drill ship (on Sunday and Monday) to pressure the ship into turning back," the statement said.

Chevron said the new move by Greenpeace was "extremely dangerous".

"Chevron North Sea appeals to Greenpeace to end its new protest at the Stena Carron while it is going about its lawful business north of Shetland," a spokesman for the firm said in a statement.

"This latest act is extremely dangerous and once again demonstrates that Greenpeace is willing to put its volunteers at risk by entering the path of the Stena Carron while the vessel is in transit."

Greenpeace is campaigning for a moratorium on drilling in the North Sea to avoid a possible repeat of the devastating oil spill sparked by a blast on the BP-leased Deepwater Horizon rig in the Gulf of Mexico earlier this year.

earlier related report
Protesters shut down Australian coal port
Newcastle, Australia (UPI) Sep 27, 2010 -The world's largest coal terminal in Australia was inoperable for several hours Sunday because of an "emergency intervention" by environmental activists.

The protesters claimed that the massive amount of coal exported is a main cause of global warming in Australia.

Several of the protesters, who broke into the facility about 5 a.m., suspended themselves from coal-loaders, effectively shutting down Newcastle Coal Terminal, north of Sydney.

The coal-loaders, which normally continue non-stop, were operational by about 2:30 p.m. Sunday, The Newcastle Herald reports. Police arrested 45 members of protest organizer Rising Tide Newcastle.

"We are exporting global warming to the world. Here in Newcastle, already the world's biggest coal port, multinational mining corporations are planning to triple exports over the next decade. It's a similar story at all coal ports in the country," said Annika Dean, spokeswoman for Rising Tide Newcastle.

Australia is the world's biggest exporter of coal.

Newcastle Port Corp. estimated that Newcastle's coal exports would reach 10 million tons for this month.

Rio Tinto Group, Xstrata Plc and BHP Billiton are among mining companies that export the fuel from Newcastle.

Demand for coal through the Port of Newcastle has grown by more than 32 percent over the past decade, says Port Waratah Coal Services, operator of the Carrington and Kooragang terminals, which have recently increased their export capacity from 113 million to 133 million tons a year.

A new $1 billion terminal was opened in March to handle 30 additional million tons of coal a year in the first stage, later upgrading to 66 million tons, and a fourth Newcastle coal terminal is being planned, to take exports to more than 300 million tons a year.

The lineup of ships waiting outside Newcastle Harbor to be loaded with coal reflects the booming demand. The queue of vessels averaged 14 in the middle of September, and reached as high as 60 last December.

"Global warming is happening now and it is killing people," Dean said, citing floods in Pakistan and China and fires in Siberia.

"Australia is a major contributor to this crisis, due to the massive volumes of coal we export."

Dean urged the Australian government to place an immediate moratorium on the expansion of the coal industry.

James Hansen, director of NASA's Goddard Institute for Space Studies, dubbed the ''godfather of climate science," has likened Australia's continued export of coal in the face of global warming to that of a ''drug dealer'' feeding the world's fossil fuel addiction.