British man Keiron Bryan has been held in jail in Russia after the Greenpeace protest ship he was travelling on was seized by authorities.
How do scientists survive -30 degrees temperatures at Barneo, the temporary camp set up on floating ice near the North Pole?
Arctic glaciers are melting faster than expected fuelling a rise in sea levels, which experts believe could cost the UK billions of pounds.
Russia has charged three more British activists with piracy after taking part in a protest against Arctic drilling by Russian energy giant Gazprom.
Greenpeace said Philip Ball, Alexandra Harris and Anthony Perrett had all been charged, along with six activists from other countries. They were onboard the Greenpeace ship Arctic Sunrise which was boarded by Russian security forces in September.
Greenpeace said earlier that British freelance filmmaker Kieron Bryan, 29, has also been charged with piracy.
Greenpeace have released new photos of its ship Arctic Sunrise apparently being boarded by Russian security forces during a protest against Arctic drilling.
Thirty activists were arrested last month while protesting against drilling by Gazprom, the Russian energy giant.
Russian authorities have charged two of the protesters with piracy, including Briton Kieron Bryan, 29, a freelance filmmaker.
Greenpeace protesters, attempting to board an oil rig in the Arctic run by Russian oil giant Gazprom, said they were threatened by armed guards from the Russian coast guard.
Greenpeace said shots were fired at activists as they attempted to reach the rig.
Video footage of the event, which happened early morning on September 18, shows the activists attempting to mount the rig, and promptly retreating after appealing to the Russian authorities to put down their guns.
Six Brits are among 25 protesters being held by Russian authorities after guards boarded Greenpeace's ship yesterday.
At least 15 armed Russian coast guards have taken over a protest ship in in the Arctic, Greenpeace said.
25 protesters, including six Britons, were arrested after guards used helicopters and robes to board the ship. The activists are still being held under armed guard, Greenpeace said.
The ship, the Arctic Sunrise, has been circling an oil platform run by energy giant Gazprom, which is setting ready to drill for oil in the Arctic. Greenpeace say they were inside international waters and outside the jurisdiction of Russian authorities, making the boarding of the ship unlawful.
The armed ship seizure comes a day after activists attempted to board the Gazprom rig. The Russian coast guard responded to the protest by firing live ammunition at protesters as they attempted to climb on to the platform, Greenpeace said.
The Government has been accused of "complacently standing by" while oil and gas drilling starts in the Arctic despite the risks to the environment and climate.
Companies such as Shell are not yet able to demonstrate they could clean up an oil spill in the harsh but pristine conditions of the Arctic, MPs on the Environmental Audit Committee (EAC) said.
And a recent report from the International Energy Agency (IEA) warned that only a third of already proven fossil fuels can be burnt before 2050 if global temperatures are to be kept from rising by more than 2C, widely regarded as the threshold for "dangerous" climate change.
The MPs reiterated their call for a sanctuary to be established in the Arctic, which is protected from oil and gas development.
British adventurer Mark Wood has warned of the dangers of embarking on Arctic challenges, claiming people "fall in love with the romance of a polar expedition" without being aware of the true dangers.
The 47-year-old, from Coventry, attempted to become the first person in history to ski solo to both the South and North Poles, but had to halt the expedition after funding cuts.
Speaking to ITV News from his base camp at Mount Everest, he said: "The Arctic is one of the most unforgiving environments on the planet.
"The dangers are hidden; cold, isolation and the ever-changing landscape.
"People fall in love with the romance of a polar expedition but when you're on the ice it's a very different matter - it sucks the strength out of you."
The Queen’s Nursing Institute has paid tribute to Philip Goodeve-Docker, who hoped to raise money for the charity with his tragic Greenland expedition.
– QNI chief executive Crystal Oldman
Our thoughts today are with Philip's family. Philip died doing something that he had always dreamed of, undertaking a great challenge while helping others at the same time.
Staff and trustees at the QNI are very shocked and saddened by this tragic loss but also immensely proud of him and his bravery.
"t is the charity's intention not to let this tragic loss of life pass without creating a suitable and enduring memorial to Philip.
Mr Goodeve-Docker also undertook the challenge in memory of his late grandfather, who was a treasurer for the QNI, which is dedicated to improving the nursing care of people in their own homes.
The British man who died during a charity trek across the Greenland ice cap was trapped in a severe snow storm for around 30 hours before emergency teams could reach him and his two friends.
Philip Goodeve-Docker, an events manager, along with expedition leader Roan Hackney and Andy Norman, a former IT professional, got into difficulty when the sudden storm hit. Mr Goodeve-Docker died before the team could be airlifted to safety.
Temperatures in Greenland dropped to as low as minus 10.5C (13F) on Saturday, while gusts of 95 miles (152km) an hour were reported on the east coast. Both Mr Hackney and Mr Norman remain in a "critical condition" in hospital, according to Mr Goodeve-Docker's brother, Mark.
The charity page set up by Philip Goodeve-Docker ahead of his trek across Greenland has attracted in excess of £6,000 as strangers continue to honour the adventurer.
Mr Goodeve-Docker took on the challenge in a bid to raise £4,000 for The Queen's Nursing Institute but died on Sunday after he and his two teammates Roan Hackney and Andy Norman got into difficulty.