A traffic jam on Mount Everest turned deadly last weekend, with fatalities being blamed on the bottleneck of climbers trying to ascend or descend the summit, reports from the mountain say.

At least four climbers died near the summit over the weekend and three others were said to be missing and feared dead, climbers told NBC News' Miguel Almaguer. But Alan Arnette, a climber who is blogging the 2012 Everest expedition season, reported that seven had died over the weekend.

The bottleneck developed after weeks of bad weather prevented climbers from summit attempts until Saturday. When the weather cleared, an estimated 150 people rushed to reach the peak, according to Almaguer.

"When there’s a bottleneck on Everest, you have a long line of climbers that really can’t pass one another," Arnette told Almaguer on TODAY Wednesday morning. "They’re stuck, they're using up their oxygen. And as a result they get cold and potentially make bad decisions."

This deadly combination of factors has caused fatalities in the past. In 1996, a bottleneck and bad weather led to the deaths of eight climbers in one day, an infamous event that was recounted in the book "Into Thin Air."

Jonathan Kedrowski, a climber on the peak who said he passed some of the victims while descending, recounted the tragic aftermath of this season’s bottleneck to Almaguer.

One man wasn't wearing a hat or gloves. "He was kind of looking at me kind of zombie-like," Kedrowski said. "Anybody that would pass him he would reach out and try to grab you. The gentleman’s hand was frozen solid."

It is believed some of the victims died from hypothermia and brain swelling, triggered by the high altitude and a lack of oxygen.

Among the confirmed deaths are Eberhard Schaaf, 61, from Aachen, Germany, Shriya Shah, a 32-year-old Nepal-born woman living in Canada, and a Korean, Song Won-Bin. Discovery News reported that a Nepalese official said 55-year-old Chinese climber Ha Wenyi had also been found dead.

"Schaaf died at the South Summit of Sagarmatha due to altitude sickness," said Ang Tshering Sherpa, chief of the Asian Trekking company that organized the expedition, referring to the Nepali name of the mountain. He said the body was lying on the mountain. 

At least two Sherpas died last month  -- one after falling into a crevasse and the other reportedly from altitude sickness, according to National Geographic magazine. More than 200 people have  died climbing Everest since 1950.

Related: 73-year-old smashes own record as oldest woman to climb Mount Everest

Eric Simonson, Himalayan program director of International Mountain Guides, told msnbc.com that his team of 11 climbers and 11 Sherpas reached the summit on Saturday. The group, he said, were toward the front of the line as they began their attempts at 8 p.m. and started reaching the summit at 4:50 a.m. The team returned safely to their camps.

He said choppers were flying to Camp 2 on Tuesday to pick up injured climbers who successfully descended. "The full story of who was hurt and who wasn’t, who dropped out and who didn’t, won’t be known for weeks," Simonson said.

Often, he said, survival comes down to whether or not climbers are realistic about their oxygen stores. "It’s like watching the needle on your gas tank. And if you know you still have to drive 200 miles and you see the gas tank is getting down to one-quarter, you’ve got to be able to do the mental math and know you’re going to stop and fill up." For Everest climbers, this might mean abandoning a summit attempt altogether if one's oxygen is too low.

The deaths mark a controversial season on Everest. On May 5, Himalayan Experience announced that it was canceling its expedition because of safety concerns. Minimal snowpack and warm temperatures, among other factors, had led to dangerous conditions, including rock fall and avalanches, the company said.

Michael Fagin, who provides forecasting services for Everest teams and runs everestweather.com from Redmond, Wash., said the spring had been very dry and windy. In the past week, winds had reached up to 80 mph; climbers on Everest prefer them under 30 mph.

Related: Climber's sky-high dreams dashed far below Everest summit

Last week, the National Geographic-North Face expedition, led by accomplished mountaineer Conrad Anker, canceled its plans to summit via the West Ridge because of icy conditions, but will still attempt to reach the peak via a different route.

Another window to summit is forecast for May 26, and Simonson expects another bottleneck as a second wave of climbers try to reach the peak.

"The bottom line is this is how it is on Mount Everest and how it has been for many years," Simonson said. "When the weather gets good, people want to summit."

Reuters contributed to this report.

Rebecca Ruiz is a reporter at msnbc.com. Follow her on Twitter here.

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The plan to remove the massive wreck of Costa Concordia, which lies half submerged off the Italian island of Giglio after capsizing in January, was revealed Friday in Rome. At least 30 people died after the ship ran aground.

Reuters

Click to enlarge the image.

In an unprecedented effort, American-owned Titan Salvage is working with Italian firm Micoperi, and will use pulling machines connected to a custom-built subsea platform to hoist the hull upright in one piece. The firms won the right to perform the work during a months-long bidding process.

The first step is stabilizing the ship to prevent further slippage down the sloped sea bed on which it rests. That is expected to take about a year, Costa said in a statement. This will be achieved by attaching "tieback chains" from the submerged part of the ship -- starboard side, closest to shore -- to a structure built nearby.

After Concordia is stabilized, the subsea platform will be built along the port side -- the non-submerged side -- and huge caissons, in essence steel boxes, will be welded to the exposed side of the ship. The caissons will be filled with water. "This gives the ship extra buoyancy," explained Mark Hoddinott, general manager of the International Salvage Union. "Caissons have the effect of making the ship wider, and the water will add mass, which improves the 'turning moment' to bring it upright."

Pulling machines will then be connected to the subsea platform, and two cranes fixed to the platform will pull Concordia upright -- facilitated by the water-filled caissons. The ship will still be flooded, so it won't float; instead it will rest on the platform. When the ship is upright, caissons will be welded to the starboard side of the hull. The caissons on both sides will then be de-ballasted -- after treating and purifying the water to protect the marine environment -- and filled with air.

"This strategy has been used on a smaller scale by both the US and Royal Navy," added Hoddinott. "But no one has removed a ship of this size." Concordia is 950 feet long and weighs 44,612 metric tons (or nearly 100 million pounds), according to Titan-Micoperi.

Once upright, the wreck will be towed to an Italian port and dealt with in accordance with the requirements of Italian authorities. Gianni Onorato, Costa Crociere S.p.A. president, told Cruise Critic in early May that the ship will ultimately be scrapped.

No details on the cost of the project have been officially released, but a Costa spokesman told CNN that the figure could exceed $300 million.

According to today's statement from Costa, the "one piece" approach -- rather than slicing the ship up and barging it off bit by bit -- will "minimize environmental impact, protect Giglio's economy and tourism industry, and maximize safety." After the ship is removed, the sea bottom will be cleaned and marine flora replanted.

While the project is ongoing, the operation base will be located on the mainland near Piombino, where equipment and materials will be stored. This will mitigate impact on the island's port activities and leave Giglio's hotels open for tourists during the peak summer season.

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CHONGQING, China – Everywhere you go in Chongqing, you can see traces of the complicated legacy of Bo Xilai, the former Communist party chief who ran this municipality of 30 million people until scandal derailed him. 

At one time destined for a top post in China’s highest echelon of power, the standing committee of the politburo of the Communist Party, Bo aggressively poured money into this municipality in pursuit of his populist agenda.

To drive through the windy roads that snake around this hilly metropolis is to see a city in constant transformation. Towers of low-income housing complexes dot the skyline. These social housing projects were meant to address a major national issue: the lack of affordable housing, and provided homes that cost just a few hundred dollars a year to rent. And Bo had gingko trees, said to be one of his favorites, planted across the city.

But these city improvements came at a cost: His heavy investment in capital construction projects forced the city to borrow so much money to pay for it that Chongqing owes $20 billion to the China Development Bank, according to a news report on Wednesday. The tree planting saddled the city with a $1.5 billion bill just for 2010 alone.  

The improvements weren’t the only controversial aspect of Bo’s reign over this important gateway city to the western half of China, and since his demise his critics have stepped out of the shadows to talk about the darker side of life in what had become the former leader’s personal fiefdom.

Told a Bo joke, got a year in a labor camp

In Chongqing, NBC News spoke with Fang Hong, a 51-year-old former forestry officer who made news earlier this week when he filed an appeal with a local court seeking compensation for what he alleged was an unfair sentence he served at a labor camp.

According to Fang, he was imprisoned for posting a two-line joke about Bo on his microblog that quickly went viral. Soon after, Fang said he was dragged in by police for questioning and later brought before a police tribunal where he was sentenced for “fabricating facts and disturbing public order.” 

Fang served his sentence at a labor camp where he said he was forced to assemble thousands of Christmas ornaments for export for one year.

Released earlier this year, Fang was emboldened by the criticism that has shrouded Bo following his high-profile falling out with his vice-mayor and former police chief, Wang Lijun, who famously sought refuge at the American embassy in Chengdu. That move by Wang sparked an international political scandal that now includes a murder mystery. Bo’s wife, Gu Kailai, is a murder suspect in the death of British businessman Neil Heywood; Bo has been officially disowned by the ruling Communist Party and has disappeared from public view.

Ed Flanagan / NBC News

A crowd gathers around Fang Hong in Chongqing to hear his story on Tuesday.

Boisterous debate on Bo
Fang agreed to do an interview with NBC News on an outside promenade with commanding views of Chongqing’s skyline and the mighty Yangtze River below. Fang spoke confidently, eager to tell his story about the deprivations he faced while interned at the labor camp.

Between the presence of a foreign camera crew and his loud denouncements of Bo Xilai, Fang quickly drew a crowd of onlookers.

The first indication that things were going to get contentious with the crowd was when one short, middle-aged man standing next to the camera started muttering under his breath as he listened to Fang. 

Taking jagged drags from his cigarette and nervously flicking ash between puffs, the man’s voice rose incrementally to voice his protestations of Fang’s opinion about Bo. Those near to the man shushed him as they strained to hear what Fang was saying, but after one particular statement, the man clearly had enough.

“That’s bull---! Bo Xilai has done so much for Chongqing!” bellowed the man as he waved his cigarette at Fang.

The crowd erupted into a loud, boisterous debate on Bo, prompting NBC News correspondent Ian Williams to wrap up the interview so that Fang could quickly leave with his lawyers.

But before he left, Fang feistily told the man what he thought of his opinion, triggering a shouting match. One of Fang’s lawyers and some of the crowd had to separate the pair.

David Lom / NBC News

Angry pro-Bo Xilai supporter voices his opinion to the crowd in Chongqing.

‘Since Bo Xilai took power I feel more secure'
Not everyone had negative feelings about the disgraced former party chief.

 One older woman in the crowd said:, “Before, I was worried to wear earrings because I was worried I’d get robbed, but since Bo Xilai I feel more secure seeing more police on the streets.”

Finally, a line of security guards rolled up and broke up the crowd. The guards were not forceful and they exchanged a few knowing nods with the throng of people who were loudly voicing their support for Bo.

Bo’s fall has clearly given his critics the opportunity they’ve long desired to voice their criticisms of him.

However, despite the accusations that paint Bo’s Chongqing was something akin to a modern-day Tammany Hall, the populism and perhaps most importantly, the pride he instilled in this mega-city suggest his popular legacy may last far longer than Communist Party officials would like.

As one driver told us, “Yeah, Bo might have been corrupt, but at least he did something for us – which is more than those corrupt officials who do nothing at all.”   

NBC News’ Bo Gu contributed to this report.

Andreas Solaro / AFP - Getty Images

Italians hold candles as they demonstrate against government policy in front of the Pantheon, in downtown Rome, on April 18, 2012. Trade union's anger is growing in Italy over the government's reform measures and public outrage over a series of suicides linked to the economic crisis.

ASOLO, Italy – On Tuesday, Generoso Armenante, a 49-year-old former security guard at a convenience store in the southern town of Salerno, left home after having lunch with his wife – and quietly found a secluded spot where he hanged himself. 

Armenante had been fired more than a year ago, and had been struggling to find another job ever since. Next to his body he left a letter: “I decided to end it because I am a failure. I can’t live without work.” 

Unfortunately, he is not alone. Tens of other Italians have also chosen to take their own lives in response to the strain of the economic crisis and the consequent austerity measures. 

On Tuesday, two other people committed suicide, apparently due to financial hardship. A 60-year-old businessman in Milan hanged himself from a tree after failing to repay his debts.

And a 64-year-old bricklayer in Salerno, who lost his job around Christmas, shot himself in the chest. He left a similar message: “I can’t live without a job.”

The three men are casualties of the debt crisis that has pushed Italy’s economy to the brink over the past year and put considerable strain on most Italians, especially those who own or work for small businesses. At least 34 people have killed themselves citing economic reasons since the start of the year, according to the Italian Association of Small Businesses. 

‘If my business fails, I fail with it’
A dramatic hike in taxes, combined with large cuts in public spending, a clampdown on tax evasion and a credit crunch from banks have pushed many Italian businesses to the brink of bankruptcy. 

Some have stuck to the old Italian script, griping about the government measures at the local cafe over a cappuccino and hoping for better times. But others have seen no way out, and have opted for death.  

The most affected region is the relatively prosperous Veneto in the northeast of Italy, home of Venice and an abundance of businessmen. 

Gianfilippo Oggioni / AP

Tiziana Marrone, right, widow of Giuseppe Campaniello, whose his picture is carried on a banner in background, and Elisabetta Bianchi take part in a demonstration to protest against Italian Premier Mario Monti's austerity measures, in Bologna, Italy, on Friday, May 4, 2012. Marrone and Bianchi claimed that their husbands committed suicide because of economic crisis.

In a part of the country that has had a reputation for skilled merchants since Venice was a maritime republic, as many as one in 10 own their own business. Some of the most recognized Italian brands, such as Benetton and Diesel, originate from the area. 

“My business is like my family,” Massimo Zappia, who owns a window frame business in Asolo, a town about 20 miles north of Venice, told NBC News. “I feel responsible for each of my employees. If my business fails, I fail with it.” 

Zappia, 42, blames the credit crisis for some of his woes as a small business owner.  “These days it takes six months for banks to make their mind up for small loans of just a few thousand dollars. And as a businessman, I feel left alone.” 

Struggling to ‘soldier on’
This feeling of failure and loneliness is at the very heart of acts of desperation among the business community in Italy. The message left by Armenante, the security guard who hanged himself on Tuesday is the same mantra repeated by workers and businessmen who either tried to kill themselves and lived to tell the tale or by those who thought about trying, but found other reasons to live. 

Giovanni, who is in his mid-40s and also lives in Asolo, admits that he thought about ending his life after failing to repay a debt of $25,000. The self-employed plumber, who asked that his last name not be used, told NBC News that he only stopped himself because he didn’t want his family to pay for his mistakes, adding that he has a disabled son and a wife with a history of psychological problems.

“It was a dark moment, and I thought there was no way out,” he said. “They strangled me economically; I just can’t keep up with repayments. I got to the point where I couldn’t go back home and look at my wife and children in the eyes, and tell them I didn’t know how to carry on,” he said. 

“There are moments when you think that there is an easy way out. It only takes a moment to die. But then you think of your family and you realize you can’t. You just need to soldier on.”

To help ease the problem, a workers’ association near Asolo started a helpline for people in distress. They received at least 60 calls in their first two months of activity, but say that it’s worried families who tend to call rather than the businessmen themselves. 

“It’s their wives that call the most, because businessmen around here are very proud,” said Stefano Zanatta, president of Confartigianato Veneto, a local business association. “They wouldn’t admit to having a problem until it becomes so big they can’t tackle it anymore.”

Some, however, do call. “Once we got a call from a businessman who couldn’t even afford to send his daughter to school,” Zanatta said. “We offer them psychological support and financial advice before it’s too late.” 

Zanatta says that he expected a dramatic hike in the number of calls during the month of June. That’s the deadline for filing tax returns in Italy, and the time when many businessmen may realize they just can’t survive the economic crisis.  

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A paragliding Greenpeace activist who dropped a smoke bomb over a French nuclear reactor on Wednesday added a new element to the presidential race there -- and raised the question of whether the same, or worse, could happen at a U.S. nuclear reactor.

"At no moment was the safety of the installations at risk," said the plant's operator, French utility giant EDF, adding that the pilot was arrested by security staff at the Bugey nuclear plant in southeast France.

EDF acknowledged that a second activist was arrested at another nuclear site in southwest France after entering via a truck gate and hiding for an hour in brush within the "surveillance zone," Reuters reported.

Greenpeace said it was raising awareness of nuclear power issues ahead of France's presidential elections on Sunday.

It "illustrates the vulnerability of French nuclear to the threat of air attack," Greenpeace France spokeswoman Sophia Majnoni d'Intignano said in a statement. "While Germany took into account the aircraft crash in its safety testing, France still refuses to analyze this risk for our plants."

France, which gets 80 percent of its electricity from nuclear power, pledged special safety tests at its 58 reactors after Japan's Fukushima nuclear disaster in March 2011.

Those tests include standing up to floods, earthquakes, power outages and cooling system failures -- but not terrorist attacks or even a plane crash.

So could a paraglider attack happen in the U.S. -- or would it be shot down before even getting to a nuclear site?

"Completely speculative," Steve Kerekes, a spokesman for the Nuclear Energy Institute, told msnbc.com. "Our facilities are extremely well-defended. Let's leave it at that."

Over at the Union of Concerned Scientists, a group that says it's neither for nor against nuclear power, two nuclear experts said that while a reactor's containment dome would be hard to penetrate other targets are available.

The intake structure, where water is brought in to cool the reactor fuel, "is an easier target," Dave Lochbaum told msnbc.com. Without coolant, that fuel could cause a meltdown.

The aerial threat exists, added Edwin Lyman, because the Nuclear Regulatory Commission "decided in 2007 to exclude any kind of aerial attack from the 'design basis threat' -- that is, the set of attacks that reactor operators must provide protection to defend against.

"So the NRC doesn't require that nuclear plants have means to detect or defend against intrusions from the air," he added. "And the federal government also does not require 'no fly zones' around nuclear plants that could be enforced by the military."

Kerekes countered by noting that an independent study in 2002 found that U.S. nuclear containment structures can withstand even a crash from a commercial airliner.

As for paragliders, Lochbaum said a more likely scenario is where one or more are used at night in an attempt to get into a nuclear plant.

"While nuclear plant security perimeter fences are well lit, the lighting is to allow security officers to catch anyone trying to climb over, cut through, or tunnel under the fences," he said. "The lights and the camera angles might not readily show someone flying in. That someone could be carrying sufficient weapons to cause problems."

At that point, Lochbaum said, "it becomes a race -- can the intruder access area(s) needed to sabotage the plant before the security officers intervene?"

Nuclear plants already test such scenarios, and Lochbaum said "the good guys sometimes lose the race" in testing -- even with the six weeks notice given by the Nuclear Regulatory Commission.

"Typically, the force-on-force tests are conducted once every three years at each U.S. nuclear plant," he said. "A test may consist of four exercises -- different entry points and different targets. It would be useful to periodically throw in a glider or parachute entry to make sure the security officers practice handling such threats, too."

Nuclear power debate in France includes Libya project

Back in France, the stunt certainly got attention -- but not all of it flattering for Greenpeace.

"The main consequence of this stupid action will be to prevent any air recreation within more areas of France," posted one person on Greenpeace's main blog on the stunt.

An anonymous post on another Greenpeace blog criticized the stunt, saying a paraglider couldn't carry enough explosives to damage nuclear containment areas. 

"You've also missed the point," the writer added, "that someone could cause far graver damage by carrying out a similar attack on the Olympic Stadium in London later in the year."

Reuters contributed to this report.

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