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Secret's out: U.S. Air Force stealth flies into the sunsetThe F-117A Nighthawk--the original stealth fighter aircraft, which made its first test flight in 1981--may have been developed in secrecy, but the U.S. Air Force gave the radar-defying combat craft a very public send-off this week at Ohio's Wright-Patterson Air Force Base. A ceremony held to bid adieu to the aging fighter concluded with a flashy flyby of one of the retiring jets, its giant underbelly painted red, white and blue. The Air Force says that it would rather spend its funding on the next generation of aircraft, including the B-2 Spirit, F-22 Raptor and soon-to-be-fielded F-35 Joint Strike Fighter. These new planes are more adept and less expensive to fly and maintain than the retiring F-117A, according to the Air Force. The old Nighthawks will be placed in storage at an airfield in the Tonopah Test Range in Nevada, where the jets flew in total secrecy and only at night until November 1988. The Cold War–era Nighthawks, nearly completely covered with a radar absorbing material, were sent into action in 1989's brief skirmish in Panama and again in 1991 during Operation Desert Storm, where they flew nearly 1,300 sorties over Iraq and Kuwait (2 percent of the total combat missions), striking 40 percent of the most highly defended, strategic targets. No teary farewell speeches at this retirement party, though; the once mighty aircraft will shortly have their wings and tails clipped and then be stored in protective hangars. Sorry, conspiracy theorists, there are no plans to stash them in Area 51. [More] Fertilizer Runoff Overwhelms Streams and Rivers--Creating Vast "Dead Zones" The water in brooks, streams and creeks from Michigan to Puerto Rico carries a heavy load of pollutants, particularly nitrates from fertilizers. These nitrogen and oxygen molecules that crops need to grow eventually make their way into rivers, lakes and oceans, fertilizing blooms of algae that deplete oxygen and leave vast "dead zones" in their wake. There, no fish or typical sea life can survive. And scientists warn that a federal mandate to produce more biofuel may make the situation even worse. [More]

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Bird flu, cholera, Ebola, plague and tuberculosis are just a few of the diseases likely to spread and get worse as a result of climate change, according to a report released yesterday by the Wildlife Conservation Society (WCS). To prevent such ailments from becoming as destructive as the "black death" (which wiped out a third of Europe's population in the 14th century) or the flu pandemic of 1918 (which killed an estimated 20 million to 40 million people worldwide, including between 500,000 and 675,000 people in the U.S.), WCS suggests monitoring wildlife to detect signs of these pathogens before a major outbreak. [More] The Physical Science behind Climate Change Editor's note: This story was originally posted in the July 2007 issue, and has been reposted to highlight the long history of Nobelists publishing in Scientific American. For a scientist studying climate change, “eureka” moments are unusually rare. Instead progress is generally made by a painstaking piecing together of evidence from every new temperature measurement, satellite sounding or climate-model experiment. Data get checked and rechecked, ideas tested over and over again. Do the observations fit the predicted changes? Could there be some alternative explanation? Good climate scientists, like all good scientists, want to ensure that the highest standards of proof apply to everything they discover. [More]

Tags: climate, change, scientist, wildlife, good

It is said that the Inuit have many words for snow, but when it comes to the Northwest Passage only one type of frozen water matters: multiyear ice. It can slice through the hull of a ship like a knife through butter and it persists in the passage's waters despite unprecedented warming in the Arctic Ocean, thwarting shippers in search of a shortcut between Europe and Asia. The fabled Northwest Passage has made headlines ever since it thawed last year for the first time. For three centuries the quest for an expedited route between the Atlantic and Pacific oceans rivaled today's space race, with European superpowers vying for the prize. Hundreds of sailors and countless expeditions ventured into Canada's Arctic waters, including such naval luminaries as Sir Francis Drake, Captain James Cook and the ill-fated Henry Hudson, who left his name--and lost his life--on the Canadian bay that marks its entrance. [More] Rise and Fall of Chinese Dynasties Tied to Changes in Rainfall In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More]

Tags: passage, northwest, water, arctic, dynasty

The ongoing disruption of the earth’s climate by man-made greenhouse gases is already well beyond dangerous and is careening toward completely unmanageable. Under midrange projections for economic growth and technological change, the planet’s average surface temperature in 2050 will be about two degrees Celsius (3.6 degrees Fahrenheit) higher than its preindustrial value. The last time the earth was that warm was 130,000 years ago, and sea level was four to six meters higher than today. No one knows how long it will take sea level to “catch up” with such an increase; it could be several centuries, or it could be less. Even with uncertainties, there is reason to believe that tipping points into unmanageable changes will become much more probable for increases larger than two degrees C. To achieve a better-than-even chance of not exceeding that figure, human emissions must start to decline soon, falling to about half of today’s level by 2050 and further thereafter. [More] Deadly by the Dozen: 12 Diseases Climate Change May Worsen Bird flu, cholera, Ebola, plague and tuberculosis are just a few of the diseases likely to spread and get worse as a result of climate change, according to a report released yesterday by the Wildlife Conservation Society (WCS). To prevent such ailments from becoming as destructive as the "black death" (which wiped out a third of Europe's population in the 14th century) or the flu pandemic of 1918 (which killed an estimated 20 million to 40 million people worldwide, including between 500,000 and 675,000 people in the U.S.), WCS suggests monitoring wildlife to detect signs of these pathogens before a major outbreak. [More]

Tags: change, climate, degrees, level, million

Bird flu, cholera, Ebola, plague and tuberculosis are just a few of the diseases likely to spread and get worse as a result of climate change, according to a report released yesterday by the Wildlife Conservation Society (WCS). To prevent such ailments from becoming as destructive as the "black death" (which wiped out a third of Europe's population in the 14th century) or the flu pandemic of 1918 (which killed an estimated 20 million to 40 million people worldwide, including between 500,000 and 675,000 people in the U.S.), WCS suggests monitoring wildlife to detect signs of these pathogens before a major outbreak. [More] Rising Acidity in the Ocean: The Other CO2 Problem Climate change caused by rising levels of atmospheric carbon dioxide (CO2) is now widely recognized. But the other side of the equation--the massive absorption of CO2 by the ocean--has received far less attention. The planet’s seas quickly absorb 25 to 30 percent of humankind’s CO2 emissions and about 85 percent in the long run, as water and air mix at the ocean’s surface. We have “disposed” of 530 billion tons of the gas in this way, and the rate worldwide is now one million tons per hour, faster than experienced on earth for tens of millions of years. We are acidifying the ocean and fundamentally changing its remarkably delicate geochemical balance. Scientists are only beginning to investigate the consequences, but comparable natural changes in our geologic history have caused several mass extinctions throughout the earth’s waters. That careful balance has survived over time because of a near equilibrium among the acids emitted by volcanoes and the bases liberated by the weathering of rock. The pH of seawater has remained steady for millions of years. Before the industrial era began, the average pH at the ocean surface was about 8.2 (slightly basic; 7.0 is neutral). Today it is about 8.1. [More]

Tags: ocean, million, climate, change, balance

It is said that the Inuit have many words for snow, but when it comes to the Northwest Passage only one type of frozen water matters: multiyear ice. It can slice through the hull of a ship like a knife through butter and it persists in the passage's waters despite unprecedented warming in the Arctic Ocean, thwarting shippers in search of a shortcut between Europe and Asia. The fabled Northwest Passage has made headlines ever since it thawed last year for the first time. For three centuries the quest for an expedited route between the Atlantic and Pacific oceans rivaled today's space race, with European superpowers vying for the prize. Hundreds of sailors and countless expeditions ventured into Canada's Arctic waters, including such naval luminaries as Sir Francis Drake, Captain James Cook and the ill-fated Henry Hudson, who left his name--and lost his life--on the Canadian bay that marks its entrance. [More] Rise and Fall of Chinese Dynasties Tied to Changes in Rainfall In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More]

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It is said that the Inuit have many words for snow, but when it comes to the Northwest Passage only one type of frozen water matters: multiyear ice. It can slice through the hull of a ship like a knife through butter and it persists in the passage's waters despite unprecedented warming in the Arctic Ocean, thwarting shippers in search of a shortcut between Europe and Asia. The fabled Northwest Passage has made headlines ever since it thawed last year for the first time. For three centuries the quest for an expedited route between the Atlantic and Pacific oceans rivaled today's space race, with European superpowers vying for the prize. Hundreds of sailors and countless expeditions ventured into Canada's Arctic waters, including such naval luminaries as Sir Francis Drake, Captain James Cook and the ill-fated Henry Hudson, who left his name--and lost his life--on the Canadian bay that marks its entrance. [More] Rise and Fall of Chinese Dynasties Tied to Changes in Rainfall In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More]

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It is said that the Inuit have many words for snow, but when it comes to the Northwest Passage only one type of frozen water matters: multiyear ice. It can slice through the hull of a ship like a knife through butter and it persists in the passage's waters despite unprecedented warming in the Arctic Ocean, thwarting shippers in search of a shortcut between Europe and Asia. The fabled Northwest Passage has made headlines ever since it thawed last year for the first time. For three centuries the quest for an expedited route between the Atlantic and Pacific oceans rivaled today's space race, with European superpowers vying for the prize. Hundreds of sailors and countless expeditions ventured into Canada's Arctic waters, including such naval luminaries as Sir Francis Drake, Captain James Cook and the ill-fated Henry Hudson, who left his name--and lost his life--on the Canadian bay that marks its entrance. [More] Rise and Fall of Chinese Dynasties Tied to Changes in Rainfall In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More]

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The baiji dolphin is functionally extinct, orangutans are disappearing and even some species of bats--the most numerous of mammals--are dying out. A new survey of the world's 5,487 mammal species--from rodents to humans--reveals that one in four are facing imminent extinction. [More] Climate change may be sparking new and bigger "dead zones" “Wasteland” conjures up visions of dusty desolation where life is fleeting and harsh--if it exists at all. Oceans, too, have their inhospitable pockets. Scientists are discovering that climate change--and not just fertilizer from farm use--may be spurring the emergence of barren underwater landscapes in coastal waters. Expanding dead zones not only spell trouble for biodiversity, but they also threaten the commercial fisheries of many nations. Dead zones are not new; they form seasonally in economically vital ecoystems worldwide, including the Gulf of Mexico and Chesapeake Bay. Agricultural runoff sparks many of these die-offs; increased use of nitrogen fertilizers has doubled the number of lifeless pockets every decade since the 1960s, resulting in 405 dead zones now dotting coastlines globally. [More]

Tags: dead, zones, mammal, climate, fertilizer

The nation of 1,200 low islands in the Indian Ocean is planning to establish a fund so that it can buy a haven for its citizens should global warming raise sea levels at a dangerous pace. Scary New World Two novels set in a chilling future where civilization barely survives: “The Dead and the Gone” and “The Hunger Games.”

Tags: sea, scary, world, pace, novels

It is said that the Inuit have many words for snow, but when it comes to the Northwest Passage only one type of frozen water matters: multiyear ice. It can slice through the hull of a ship like a knife through butter and it persists in the passage's waters despite unprecedented warming in the Arctic Ocean, thwarting shippers in search of a shortcut between Europe and Asia. The fabled Northwest Passage has made headlines ever since it thawed last year for the first time. For three centuries the quest for an expedited route between the Atlantic and Pacific oceans rivaled today's space race, with European superpowers vying for the prize. Hundreds of sailors and countless expeditions ventured into Canada's Arctic waters, including such naval luminaries as Sir Francis Drake, Captain James Cook and the ill-fated Henry Hudson, who left his name--and lost his life--on the Canadian bay that marks its entrance. [More] Rise and Fall of Chinese Dynasties Tied to Changes in Rainfall In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More]

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It is said that the Inuit have many words for snow, but when it comes to the Northwest Passage only one type of frozen water matters: multiyear ice. It can slice through the hull of a ship like a knife through butter and it persists in the passage's waters despite unprecedented warming in the Arctic Ocean, thwarting shippers in search of a shortcut between Europe and Asia. The fabled Northwest Passage has made headlines ever since it thawed last year for the first time. For three centuries the quest for an expedited route between the Atlantic and Pacific oceans rivaled today's space race, with European superpowers vying for the prize. Hundreds of sailors and countless expeditions ventured into Canada's Arctic waters, including such naval luminaries as Sir Francis Drake, Captain James Cook and the ill-fated Henry Hudson, who left his name--and lost his life--on the Canadian bay that marks its entrance. [More] Rise and Fall of Chinese Dynasties Tied to Changes in Rainfall In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More]

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In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More] Electronics Industry Changes the Climate with New Greenhouse Gas Emissions of a greenhouse gas that has 17,000 times the planet-warming capacity of carbon dioxide are at least four times higher than had been previously estimated. Nitrogen trifluoride (NF3) is used mainly by the semiconductor industry to clean the chambers in which silicon chips are made. The industry had in the past estimated that most of the gas was expended during the cleaning process and only about 2 percent escaped into the air. But the first-ever measurements of nitrogen trifluoride levels in the atmosphere, published recently in the journal Geophysical Research Letters show that emissions could be as high as 16 percent. [More]

Tags: industry, gas, greenhouse, climate, dynasty

Two novels set in a chilling future where civilization barely survives: “The Dead and the Gone” and “The Hunger Games.” Cuddly Creatures Three fanciful picture books about bears, and one sad one about global warming: “A Visitor for Bear,”“Bear’s Picture,”“Wonder Bear,” and “Ice Bears.”

Tags: bear, picture, books, fanciful, sad

In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More] Electronics Industry Changes the Climate with New Greenhouse Gas Emissions of a greenhouse gas that has 17,000 times the planet-warming capacity of carbon dioxide are at least four times higher than had been previously estimated. Nitrogen trifluoride (NF3) is used mainly by the semiconductor industry to clean the chambers in which silicon chips are made. The industry had in the past estimated that most of the gas was expended during the cleaning process and only about 2 percent escaped into the air. But the first-ever measurements of nitrogen trifluoride levels in the atmosphere, published recently in the journal Geophysical Research Letters show that emissions could be as high as 16 percent. [More]

Tags: industry, gas, greenhouse, climate, dynasty

Two novels set in a chilling future where civilization barely survives: “The Dead and the Gone” and “The Hunger Games.” Cuddly Creatures Three fanciful picture books about bears, and one sad one about global warming: “A Visitor for Bear,”“Bear’s Picture,”“Wonder Bear,” and “Ice Bears.”

Tags: bear, picture, books, fanciful, sad

Two novels set in a chilling future where civilization barely survives: “The Dead and the Gone” and “The Hunger Games.” Cuddly Creatures Three fanciful picture books about bears, and one sad one about global warming: “A Visitor for Bear,”“Bear’s Picture,”“Wonder Bear,” and “Ice Bears.”

Tags: bear, picture, books, fanciful, sad

In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More] Electronics Industry Changes the Climate with New Greenhouse Gas Emissions of a greenhouse gas that has 17,000 times the planet-warming capacity of carbon dioxide are at least four times higher than had been previously estimated. Nitrogen trifluoride (NF3) is used mainly by the semiconductor industry to clean the chambers in which silicon chips are made. The industry had in the past estimated that most of the gas was expended during the cleaning process and only about 2 percent escaped into the air. But the first-ever measurements of nitrogen trifluoride levels in the atmosphere, published recently in the journal Geophysical Research Letters show that emissions could be as high as 16 percent. [More]

Tags: industry, gas, greenhouse, climate, dynasty

Two novels set in a chilling future where civilization barely survives: “The Dead and the Gone” and “The Hunger Games.” Cuddly Creatures Three fanciful picture books about bears, and one sad one about global warming: “A Visitor for Bear,”“Bear’s Picture,”“Wonder Bear,” and “Ice Bears.”

Tags: bear, picture, books, fanciful, sad

In the late ninth century a disastrous harvest precipitated by drought brought famine to China under the rule of the Tang dynasty. By A.D. 907--after nearly three centuries of rule--the dynasty fell when its emperor, Ai, was deposed, and the empire was divided. According to the atmospheric record contained in a stalagmite, one of the causes of that downfall may have been climate change. [More] Electronics Industry Changes the Climate with New Greenhouse Gas Emissions of a greenhouse gas that has 17,000 times the planet-warming capacity of carbon dioxide are at least four times higher than had been previously estimated. Nitrogen trifluoride (NF3) is used mainly by the semiconductor industry to clean the chambers in which silicon chips are made. The industry had in the past estimated that most of the gas was expended during the cleaning process and only about 2 percent escaped into the air. But the first-ever measurements of nitrogen trifluoride levels in the atmosphere, published recently in the journal Geophysical Research Letters show that emissions could be as high as 16 percent. [More]

Tags: industry, gas, greenhouse, climate, dynasty