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Source: Mother Jones, March /April, 2006
Title: The Fate of the Ocean
Author: Julia Whitty
Oceanic problems once found on a local scale are now pandemic. Data from oceanography, marine biology, meteorology, fishery science, and glaciology reveal that the seas are changing in ominous ways. A vortex of cause and effect wrought by global environmental dilemmas is changing the ocean from a watery horizon with assorted regional troubles to a global system in alarming distress.
According to oceanographers the oceans are one, with currents linking the seas and regulating climate. Sea temperature and chemistry changes, along with contamination and reckless fishing practices, intertwine to imperil the world’s largest communal life source.
In 2005, researchers from the Scripps Institution of Oceanography and the Lawrence Livermore National Laboratory found clear evidence the ocean is quickly warming. They discovered that the top half-mile of the ocean has warmed dramatically in the past forty years as a result of human-induced greenhouse gases.
One manifestation of this warming is the melting of the Arctic. A shrinking ratio of ice to water has set off a feedback loop, accelerating the increase in water surfaces that promote further warming and melting. With polar waters growing fresher and tropical seas saltier, the cycle of evaporation and precipitation has quickened, further invigorating the greenhouse effect. The ocean’s currents are reacting to this freshening, causing a critical conveyor that carries warm upper waters into Europe’s northern latitudes to slow by one third since 1957, bolstering fears of a shut down and cataclysmic climate change. This accelerating cycle of cause and effect will be difficult, if not impossible, to reverse.
Atmospheric litter is also altering sea chemistry, as thousands of toxic compounds poison marine creatures and devastate propagation. The ocean has absorbed an estimated 118 billion metric tons of carbon dioxide since the onset of the Industrial Revolution, with 20 to 25 tons being added to the atmosphere daily. Increasing acidity from rising levels of CO2 is changing the ocean’s PH balance. Studies indicate that the shells and skeletons possessed by everything from reef-building corals to mollusks and plankton begin to dissolve within forty-eight hours of exposure to the acidity expected in the ocean by 2050. Coral reefs will almost certainly disappear and, even more worrisome, so will plankton. Phytoplankton absorb greenhouse gases, manufacture oxygen, and are the primary producers of the marine food web.
Mercury pollution enters the food web via coal and chemical industry waste, oxidizes in the atmosphere, and settles to the sea bottom. There it is consumed, delivering mercury to each subsequent link in the food chain, until predators such as tuna or whales carry levels of mercury as much as one million times that of the waters around them. The Gulf of Mexico has the highest mercury levels ever recorded, with an average of ten tons of mercury coming down the Mississippi River every year, and another ton added by offshore drilling.
Along with mercury, the Mississippi delivers nitrogen (often from fertilizers). Nitrogen stimulates plant and bacterial growth in the water that consume oxygen, creating a condition known as hypoxia, or dead zones. Dead zones occur wherever oceanic oxygen is depleted below the level necessary to sustain marine life. A sizable portion of the Gulf of Mexico has become a dead zone—the largest such area in the U.S. and the second largest on the planet, measuring nearly 8,000 square miles in 2001. It is no coincidence that almost all of the nearly 150 (and counting) dead zones on earth lay at the mouths of rivers. Nearly fifty fester off U.S. coasts. While most are caused by river-borne nitrogen, fossil fuel-burning plants help create this condition, as does phosphorous from human sewage and nitrogen emissions from auto exhaust.
Meanwhile, since its peak in 2000, the global wild fish harvest has begun a sharp decline despite progress in seagoing technologies and intensified fishing. So-called efficiencies in fishing have stimulated unprecedented decimation of sealife. Long-lining, in which a single boat sets line across sixty or more miles of ocean, each baited with up to 10,000 hooks, captures at least 25 percent unwanted catch. With an estimated 2 billion hooks set each year, as much as 88 billion pounds of life a year is thrown back to the ocean either dead or dying. Additionally, trawlers drag nets across every square inch of the continental shelves every two years. Fishing the sea floor like a bulldozer, they level an area 150 times larger than all forest clearcuts each year and destroy seafloor ecosystems. Aquaculture is no better, since three pounds of wild fish are caught to feed every pound of farmed salmon. A 2003 study out of Dalhousie University in Nova Scotia concluded, based on data dating from the 1950s, that in the wake of decades of such onslaught only 10 percent of all large fish (tuna, swordfish) and ground fish (cod, hake, flounder) are left anywhere in the ocean.
Other sea nurseries are also threatened. Fifteen percent of seagrass beds have disappeared in the last ten years, depriving juvenile fish, manatees, and sea turtles of critical habitats. Kelp beds are also dying at alarming rates.
While at no time in history has science taught more about how the earth’s life-support systems work, the maelstrom of human assault on the seas continues. If human failure in governance of the world’s largest public domain is not reversed quickly, the ocean will soon and surely reach a point of no return.
Comment:
After release of the Pew Oceans Commission report, U.S. media, most notably The Washington Post and National Public Radio in 2003 and 2004, covered several stories regarding impending threats to the ocean, recommendations for protection, and President Bush’s response. However, media treatment of the collective acceleration of ocean damage and cross-pollination of harm was left to Julia Whitty in her lengthy feature. In April of 2006, Time Magazine presented an in-depth article about earth at “the tipping point,” describing the planet as an overworked organism fighting the consequences of global climate change on shore and sea. In her Mother Jones article, Whitty presented a look at global illness by directly examining the ocean as earth’s circulatory, respiratory, and reproductive system.
Following up on “The Last Days of the Ocean,” Mother Jones has produced “Ocean Voyager,” an innovative web-based adventure that includes videos, audio interviews with key players, webcams, and links to informative web pages created by more than twenty organizations. The site is a tour of various ocean trouble spots around the world, which highlights solutions and suggests actions that can be taken to help make a difference.
UPDATE BY JULIA WHITTY
This story is awash with new developments. Scientists are currently publishing at an unprecedented rate their observations—not just predictions—on the rapid changes underway on our ocean planet. First and foremost, the year 2005 turned out to be the warmest year on record. This reinforces other data showing the earth has grown hotter in the past 400 years, and possibly in the past 2,000 years. A study out of the National Center for Atmospheric Research found ocean temperatures in the tropical North Atlantic in 2005 nearly two degrees Fahrenheit above normal; this turned out to be the predominant catalyst for the monstrous 2005 hurricane season—the most violent season ever seen.
The news from the polar ice is no better. A joint NASA/University of Kansas study in Science (02/06) reveals that Greenland’s glaciers are surging towards the sea and melting more than twice as fast as ten years ago. This further endangers the critical balance of the North Atlantic meridional overturning circulation, which holds our climate stable. Meanwhile, in March, the British Antarctic Survey announced their findings that the “global warming signature” of the Antarctic is three times larger than what we’re seeing elsewhere on Earth—the first proof of broadscale climate change across the southern continent.
Since “The Fate of the Ocean” went to press in Mother Jones magazine, evidence of the politicization of science in the global climate wars has also emerged. In January 2006 NASA’s top climate scientist, James Hansen, accused the agency of trying to censor his work. Four months later, Hansen’s accusations were echoed by scientists at the National Oceanic and Atmospheric Administration, as well as by a U.S. Geological Survey scientist working at a NOAA lab, who claimed their work on global climate change was being censored by their departments, as part of a policy of intimidation by the anti-science Bush administration.
Problems for the ocean’s wildlife are escalating too. In 2005, biologists from the U.S. Minerals Management Service found polar bears drowned in the waters off Alaska, apparent victims of the disappearing ice. In 2006, U.S. Geological Survey Alaska Science Center researchers found polar bears killing and eating each other in areas where sea ice failed to form that year, leaving the bears bereft of food. In response, the International Union for the Conservation of Nature and Natural Resources revised their Red List for polar bears—upgrading them from “conservation dependent” to “vulnerable.” In February, the U.S. Fish and Wildlife Service announced it would begin reviewing whether polar bears need protection under the Endangered Species Act.
Since my report, the leaders of two influential commissions—the Pew Oceans Commission and the U.S. Commission on Ocean Policy—gave Congress, the Bush administration, and our nation’s governors a “D+” grade for not moving quickly enough to address their recommendations for restoring health to our nation’s oceans.
Most of these stories remain out of view, sunk with cement boots in the backwaters of scientific journals. The media remains unable to discern good science from bad, and gives equal credence to both, when they give any at all. The story of our declining ocean world, and our own future, develops beyond the ken of the public, who forge ahead without altering behavior or goals, and unimpeded by foresight.
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