Pictures: Centralia Mine Fire, at 50, Still Burns With Meaning

Photograph from AP

Hours after plunging into the Earth, Todd Domboski stares at the abyss that briefly swallowed him—a hole swirling with toxic gases from an underground mine fire.

On February 14, 1981, 12-year-old Domboski sank into a cave-in that ruptured the soil in his grandmother's backyard in Centralia, Pennsylvania, where an abandoned coal mine had smoldered for 19 years.

The Centralia blaze, still burning more than 50 years after it began, ranks as the worst mine fire in the United States. But it is by no means the only one. More than 200 underground and surface coal fires are burning in 14 states, according to the U.S. Department of Interior's Office of Surface Mining Reclamation and Enforcement.

And with worldwide demand for coal surging, especially in industrializing nations such as India and China, mine fires have emerged as a global environmental and public health threat. Thousands of coal fires rage on every continent but Antarctica, endangering nearby communities. The blazes spew toxic substances such as benzene, hydrogen sulfide, mercury, and arsenic, as well as greenhouse gases like methane and carbon dioxide. (See related story: "Seeking a Safer Future for Electricity's Coal Ash Waste.")

In Centralia, Domboski survived his 45-second ordeal by grabbing onto tree roots. He screamed for help until his cousin ran to his aid, reached into the void, and hoisted him out.

Many Centralia residents had long feared a calamity like the one that nearly unfolded that Valentine's Day. Four years earlier, Domboski's father had told a reporter, "I guess some kid will have to get killed by the gas or by falling in one of these steamy holes before anyone will call it an emergency."

—Joan Quigley

Joan Quigley is author of the 2007 book about Centralia, The Day the Earth Caved In: An American Mining Tragedy.

This story is part of a special series that explores energy issues. For more, visit The Great Energy Challenge.

Published January 8, 2013

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Pictures: Wildfires Scorch Australia Amid Record Heat

Photograph by Jo Giuliani, European Pressphoto Agency

Smoke from a wildfire mushrooms over a beach in Forcett, Tasmania, on January 4. (See more wildfire pictures.)

Wildfires have engulfed southeastern Australia, including the island state of Tasmania, in recent days, fueled by dry conditions and temperatures as high as 113ºF (45ºC), the Associated Press reported. (Read "Australia's Dry Run" inNational Geographic magazine.)

No deaths have been reported, though a hundred people are unaccounted for in the town of Dunalley, where the blazes destroyed 90 homes.

"You don't get conditions worse than this," New South Wales Rural Fire Service Commissioner Shane Fitzsimmons told the AP.

"We are at the catastrophic level, and clearly in those areas leaving early is your safest option."

Published January 8, 2013

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2012: Hottest Year on Record for Continental U.S.

Temperatures across the continental United States soared in 2012 to an all-time high, making last year the warmest year on record for the country by a wide margin, scientists say. (Related: "July Hottest Month on Record in U.S.—Warming and Drought to Blame?")

"2012 marks the warmest year on record for the contiguous U.S., with the year consisting of a record warm spring, the second warmest summer, the fourth warmest winter, and a warmer than average autumn," Jake Crouch, a climate scientist at the National Climatic Data Center at the U.S. National Oceanic and Atmospheric Administration (NOAA), said in a press conference Tuesday.

According to a new NOAA report, the average temperature for the lower 48 states in 2012 was 55.3 degrees Fahrenheit (13 degrees Celsius), which is higher than the previous 1998 record by one degree Fahrenheit (0.6 degree Celsius).

A single degree difference might not seem like much, but it is an unusually large margin, scientists say. Annual temperature records typically differ by just tenths of a degree Fahrenheit.

"That is quite a bit for a whole year averaged over the whole country," said Anthony Barnston, chief forecaster at Columbia University's International Research Institute for Climate and Society (IRI), who was not involved in the study.

2012: An Odd Year

To put that difference in perspective, said NOAA's Crouch, consider that the entire range of temperature increase between the coldest year on record, which occurred in 1917, and the previous hottest year in 1998 was just 4.2 degrees Fahrenheit (2.3 degrees Celsius).

"2012 is now more than one degree above the top of that. So we're talking about well above the pack in terms of all the years we have data for the U.S.," he added.

2012 was also the 15th driest year on record for the nation: The average precipitation total for the contiguous U.S. was 26.57 inches (67.5 centimeters), 2.57 inches (6.5 centimeters) below average.

Moreover, every single one of the lower 48 states had above average temperatures. Nineteen states had their warmest year on record and an additional 26 states experienced one of their top ten warmest years on record.

2012 was unusual in another way for the nation, according to the NOAA report. Last year was the second most extreme year on record for the U.S., with 11 natural disasters such as Hurricane Sandy and a widespread drought that each cost at least a billion dollars in losses. (See pictures of the U.S. drought.)

Global Warming at Play?

The country's record year can't be explained by natural climate variability alone, noted Kevin Trenberth, a senior scientist at the Boulder, Colorado-based National Center for Atmospheric Research.

"It is abundantly clear that we are seeing [human-caused] climate change in action," Trenberth, who also did not participate in the NOAA report, said in an email. "These records do not occur like this in an unchanging climate." (Test your global warming knowledge.)

(Also see "Climate Predictions: Worst-Case May Be Most Accurate, Study Finds.")

Just how much of a role climate change played is still unclear, however. "That's kind of hard to state at this point," NOAA's Crouch said.

"Climate change has had a role in this ... but it's hard for us to say at this time what amount of the 2012 temperature was dependent on climate change and what part was dependent on local variability."

For example, Columbia University's Barnston pointed out, an atmospheric weather pattern known as the North Atlantic Oscillation (NAO) was in the positive phase for much of the winter of 2012, which lead to warmer winters in the eastern U.S.

Warming Trend May Continue

There's no guarantee that the weather pattern will continue in 2013. "It could be in the negative phase, which would make it more like it was a few years ago when we had very snowy winters in the eastern part of the country," Barnston said.

The NAO is an example of "a factor that makes the U.S. annual mean temperature kind of jog up and down from year to year. It won't just gradually go straight up with global warming. It can take big dips and have big jumps."

But if climate change continues unchecked, heat records will become more common, NOAA's Crouch said.

"If the warming trend continues, we will expect to see more warmer than average years."

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Albino-like Bald Eagle Spotted in Washington State

Talk about an odd bird—a bald eagle with white spots has been seen in Washington State.

Photographers Chris Teren and Traci Walter snapped the bird feeding on the Nooksack River, near Bellingham (map), on January 6. (Also see "'White,' Albino-like Penguin Found in Antarctica.")

"It was chaotic, with eagles flying and calling everywhere, then in came this eagle. It didn't take me long to figure out what we saw was something very special," Walter told National Geographic News by email.

"I was so excited, but I contained myself and focused on this eagle, and wound up with some great shots. I have seen a couple leucistic animals before, and figured that's what was going on."

Indeed, the animal likely has leucism, according to Andrew Griswold, an expert on bald eagles and director of ecotravel for the Connecticut Audubon Society.

Leucism is a mutation that prevents melanin, or pigment, from being produced in parts of an animal's body. In the case of birds, the pigment is absent from some feathers.

Another condition that creates white coloration in animals is albinism, which occurs when an animal produces no melanin at all throughout its entire body. (See pictures of albino animals.)

Bald eagles on the cusp of adulthood have similar mottled feathers, but in this case, the bird has the telltale golden eyes and beak of an adult, added Teresa McGill, a wildlife photographer with McGill's Nature in Motion. The pure-white head is also a sign of adulthood.

"This is an extremely mature eagle, [and it's] not just going through its change of plumage. Beautiful!" McGill said by email.

Odd Eagle May Have Romantic Woes

Leucism is seen in many bird species, although it's relatively rare, noted Patrick Comins, director of bird conservation for Audubon Connecticut. Comins has seen only a handful in his lifetime of bird-watching, mostly in red-tailed hawks.

Their rarity may be because leucistic birds are at a disadvantage. Unless they live in snowy regions, their striking white color may be more noticeable to predators or prey and may also turn off members of their own species.

The recently photographed bald eagle probably doesn't have trouble feeding or staying safe, since the large birds have few predators and scavenge their prey.

However, the fact that the bird looks like a teenager could be problematic, he said.

The plumage "might give a signal to another eagle that's a potential mate: This is not quite an adult bird, why would I want to mate with it?" Comins said.

Luckily, though, the bald eagle as a species is "a tremendous conservation success story," he noted. Once federally endangered, the well-known bird has rebounded from an estimated 16,000 birds in 1999 to at least 26,000 in 2011.

Added photographer Walter, who has watched wildlife her whole life, the rare eagle "was a sighting I will never forget."

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See Near-Earth Asteroid Buzz Our Planet—Live

 The asteroid Apophis, pictured here in three colors, will whiz by Earth later today. Image courtesy B. Altieri and C. Kiss, ESA/MPE/Konkoly

Sky-watchers can enjoy a close encounter today with an infamous asteroid once (erroneously) thought to pose a serious threat to Earth—the force of an impact would be like detonating tens of thousands of "Little Boy" atomic bombs. Slooh Space Camera will stream a live look at Apophis, which at a comfortable distance of 9 million miles (14.5 million kilometers), poses no present risk but still has an extremely remote chance of smashing into Earth on future passes.

"Back in 2004 when this asteroid was discovered there was concern that it had a relatively high probability of impacting Earth, a 1 in 45 chance during the 2029 flyby," said Slooh president Patrick Paolucci. "Fortunately they were able to determine that was inaccurate. But on that next approach in 2029, it's still going to be closer [to Earth] than our satellites. That's really why this event is on our radar."

Watch Now

Scientists will watch Apophis to better fine-tune its future path. Wednesday's pass could even influence the miniscule possibility (1 in 250,000 by NASA estimates) that the 885-foot (270-meter) rock might actually hit Earth in 2036. It would happen only in the extremely unlikely and unlucky event that Earth's gravity alters the rock's orbit in precisely the wrong way and creates a collision course.

Apophis is one of many asteroids orbiting between Earth and the sun that may pose future impact threats, and any close look is an opportunity to learn more about them. (See more asteroid pictures.)

"People may be surprised how many of these asteroids come whizzing past us and some of them are unexpected, which is scary," Paolucci said. "2012 LZ1, for example, was a big asteroid that was only discovered a few days before it flew by Earth. We streamed that live and it was a really cool show, but also an eye-opener for us. We want to cover these objects for the general public and bring awareness so that people can understand what's going on out there."

Slooh will capture and stream live images of the flyby from its high-altitude observatory on the island of Tenerife, in the Canary Islands. Free live shows with real-time discussion by Paolucci and others begin at 4 p.m. PST/7 p.m. EST on Slooh.com.

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Pictures: Florida Wildlife Corridor to Protect Bears, Panthers

Photograph by Carlton Ward

Bears in Florida aren't just the stuff of Disney—the Sunshine State is home to at least three thousand black bears, including M13, pictured, a male captured in Highlands County (map) in 2006.

But due to human activities, bears and other Florida wildlife are increasingly isolated in remote patches of habitat, preventing them from moving freely through their territories and potentially leading to the local extinction of some species.

That's partly why, a year ago this January, a team of explorers set off on a hundred-day, 1,000-mile (1,600-kilometer) expedition to drum up awareness and support for a proposed Florida Wildlife Corridor, a strip of uninterrupted wild and rural land that would link landscapes from the Florida Peninsula all the way to Georgia. (Related blog: "Follow Carlton Ward's 1,000-Mile Trek Through Florida.")

The corridor would protect wide-ranging species such as the black bear; keep the watershed that drains into the Everglades clean and safe; and also maintain ranches and farms, which house much of the potential corridor land, Carlton Ward, Jr., a National Geographic explorer and conservation photographer who led the expedition, said recently. (National Geographic News is a division of the National Geographic Society.)

"Despite very intensive development, we still have a chance to create a corridor that touches millions of acres of high-quality conservation land," Ward said.

The Florida Wildlife Corridor is gaining recognition within state agencies, Ward said, and formal recognition is a near-term goal.

Overall, the state's wild wonders are "really an untold story," he said.

"This is Florida—it's not just coast, beaches, and amusement parks."

—Christine Dell'Amore

Published January 9, 2013

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Embryonic Sharks Freeze to Avoid Detection

Jane J. Lee

Although shark pups are born with all the equipment they'll ever need to defend themselves and hunt down food, developing embryos still stuck in their egg cases are vulnerable to predators. But a new study finds that even these baby sharks can detect a potential predator, and play possum to avoid being eaten.

Every living thing gives off a weak electrical field. Sharks can sense this with a series of pores—called the ampullae of Lorenzini—on their heads and around their eyes, and some species rely on this electrosensory ability to find food buried in the seafloor. (See pictures of electroreceptive fish.)

Two previous studies on the spotted catshark (Scyliorhinus canicula) and the clearnose skate (Raja eglanteria)—a relative of sharks—found similar freezing behavior in their young. But new research by shark biologist and doctoral student Ryan Kempster at the University of Western Australia has given scientists a more thorough understanding of this behavior.

It all started because Kempster wanted to build a better shark repellent. Since he needed to know how sharks respond to electrical fields, Kempster decided to use embryos. "It's very hard to test this in the field because you need to get repeated responses," he said. And you can't always get the same shark to cooperate multiple times. "But we could use embryos because they're contained within an egg case."

Cloaking Themselves

So Kempster got his hands on 11 brownbanded bamboo shark (Chiloscyllium punctatum) embryos and tested their reactions to the simulated weak electrical field of a predator. (Popular pictures: Bamboo shark swallowed whole—by another shark.)

In a study published today in the journal PLoS One, Kempster and his colleagues report that all of the embryonic bamboo sharks, once they reached later stages of development, reacted to the electrical field by ceasing gill movements (essentially, holding their breath), curling their tails around their bodies, and freezing.

A bamboo shark embryo normally beats its tail to move fresh seawater in and out of its egg case. But that generates odor cues and small water currents that can give away its position. The beating of its gills as it breathes also generates an electrical field that predators can use to find it.

"So it cloaks itself," said neuroecologist Joseph Sisneros, at the University of Washington in Seattle, who was not involved in the study. "[The embryo] shuts down any odor cues, water movement, and its own electrical signal."

Sisneros, who conducted the previous clearnose skate work, is delighted to see that this shark species also reacts to external electrical fields and said it would be great to see whether this is something all shark, skate, and ray embryos do.

Marine biologist Stephen Kajiura, at Florida Atlantic University, is curious to know how well the simulated electrical fields compare to the bamboo shark's natural predators—the experimental field was on the higher end of the range normally given off.

"[But] they did a good job with [the study]," Kajiura said. "They certainly did a more thorough study than anyone else has done."

Electrifying Protection?

In addition to the freezing behavior he recorded in the bamboo shark embryos, Kempster found that the shark pups remembered the electrical field signal when it was presented again within 40 minutes and that they wouldn't respond as strongly to subsequent exposures as they did initially.

This is important for developing shark repellents, he said, since some of them use electrical fields to ward off the animals. "So if you were using a shark repellent, you would need to change the current over a 20- to 30-minute period so the shark doesn't get used to that field."

Kempster envisions using electrical fields to not only keep humans safe but to protect sharks as well. Shark populations have been on the decline for decades, due partly to ending up as bycatch, or accidental catches, in the nets and on the longlines of fishers targeting other animals.

A 2006 study estimated that as much as 70 percent of landings, by weight, in the Spanish surface longline fleet were sharks, while a 2007 report found that eight million sharks are hooked each year off the coast of southern Africa. (Read about the global fisheries crisis in National Geographic magazine.)

"If we can produce something effective, it could be used in the fishing industry to reduce shark bycatch," Kempster said. "In [America] at the moment, they're doing quite a lot of work trying to produce electromagnetic fish hooks." The eventual hope is that if these hooks repel the sharks, they won't accidentally end up on longlines.

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