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The World Meteorological Organization (WMO) reports that the amounts of atmospheric greenhouse gases reached a new high in 2013, driven by rapidly rising levels of carbon dioxide.
The news is consistent with trends in fossil fuel consumption. But what comes as more of a surprise is the WMO’s revelation that the current rate of ocean acidification, which greenhouse gases (GHGs) help to cause, appears unprecedented in at least the last 300 million years.
The details of growing GHG levels are in the annual Greenhouse Gas Bulletin, published by the WMO—the United Nations specialist agency that plays a leading role in international efforts to monitor and protect the environment.
They show that between 1990 and 2013 there was a 34 percent increase in radiative forcing—the warming effect on our climate—because of long-lived greenhouse gases such as carbon dioxide (CO2), methane and nitrous oxide.
Complex interactions
The Bulletin reports on atmospheric concentrations—not emissions—of greenhouse gases. Emissions are what go into the atmosphere, while concentrations are what stay there after the complex system of interactions between the atmosphere, biosphere (the entire global ecological system) and the oceans.
About a quarter of total emissions are taken up by the oceans and another quarter by the biosphere, cutting levels of atmospheric CO2.
In 2013, the atmospheric concentration of CO2 was 142 percent higher than before the Industrial Revolution started, in about 1750. Concentrations of methane and nitrous oxide had risen by 253 percent and 121 percent respectively.
The observations from WMO’s Global Atmosphere Watch network showed that CO2 levels increased more from 2012 to 2013 than during any other year since 1984. Scientists think this may be related to reduced CO2 absorption by the Earth’s biosphere, as well as by the steady increase in emissions.
Although the oceans lessen the increase in CO2 that would otherwise happen in the atmosphere, they do so at a price to marine life and to fishing communities—and also to tourism. The Bulletin says the oceans appear to be acidifying faster than at any time in at least the last 300 million years.
“We know without any doubt that our climate is changing and our weather is becoming more extreme due to human activities such as the burning of fossil fuels,” said the WMO's secretary-general, Michel Jarraud.
Running out of time
“The Greenhouse Gas Bulletin shows that, far from falling, the concentration of carbon dioxide in the atmosphere actually increased last year at the fastest rate for nearly 30 years. We are running out of time. The laws of physics are non-negotiable.
“The Bulletin provides a scientific base for decision-making. We have the knowledge and we have the tools for action to try to keep temperature increases within 2°C to give our planet a chance and to give our children and grandchildren a future. Pleading ignorance can no longer be an excuse for not acting.”
Wendy Watson-Wright, executive secretary of the Intergovernmental Oceanographic Commission of UNESCO, said: “It is high time the ocean, as the primary driver of the planet’s climate and attenuator of climate change, becomes a central part of climate change discussions.
“If global warming is not a strong enough reason to cut CO2 emissions, ocean acidification should be, since its effects are already being felt and will increase for many decades to come.”
The amount of CO2 in the atmosphere reached 396.0 parts per million (ppm) in 2013. At the current rate of increase, the global annual average concentration is set to cross the symbolic 400 ppm threshold within the next two years.
More potent
Methane, in the short term, is a far more powerful greenhouse gas than CO2—34 times more potent over a century, but 84 times more over 20 years.
Atmospheric methane reached a new high of about 1,824 parts per billion (ppb) in 2013, because of increased emissions from human sources. Since 2007, it has started increasing again, after a temporary period of levelling-off.
Nitrous oxide’s atmospheric concentration in 2013 was about 325.9 ppb. Its impact on climate, over a century, is 298 times greater than equal emissions of CO2. It also plays an important role in the destruction of the ozone layer that protects the Earth from harmful ultraviolet solar radiation.
The oceans currently absorb a quarter of anthropogenic CO2 emissions—about 4kg of CO2 per day per person. Acidification will continue to accelerate at least until mid-century, according to projections from Earth system models.
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The waters off the U.S. state of Alaska are some of the best fishing grounds anywhere, teeming with salmon and with shellfish such as crab.
But a new study, funded by the U.S. National Oceanic and Atmospheric Administration (NOAA), says growing acidification of Alaska’s waters, particularly those off the southern coast, threatens the state’s whole economy—largely dependent on the fishing industry.
The study, which appears in the journal Progress in Oceanography, says that not only will the state’s commercial fishing sector be badly hit by a growth in acidification, but it will also affect subsistence fisherpeople whose diet mainly consists of the catch from local waters.
Forming acid
The oceans act as a “carbon sink,” absorbing vast amounts of carbon dioxide. Acidification occurs when amounts of carbon dioxide are dissolved into seawater, where it forms carbolic acid.
Scientists say the oceans are now 30 percent more acidic than they were at the beginning of the industrial revolution about 250 years ago.
Among the sea species most vulnerable to acidification are shellfish, because a build-up of acid in waters prevents species developing their calcium shells. Alaska’s salmon stocks are also at risk as one of the main ingredients of a salmon diet are pteropods, small shell creatures.
Jeremy Mathis, an NOAA oceanographer and a lead author of the study, told the Alaska Dispatch News that whereas past reports had focused on the consequences of increased acidification on ocean species, the aim of this one was designed to examine the wider economic impact.
“This is an economic-social study,” Mathis said. “It focuses on food security, employment opportunity and the size of the economy.”
Mathis said acidification is more likely in Alaskan waters than in many other parts of the world. He explained: “It’s all about geography. The world’s ocean currents end their cycles here, depositing carbon dioxide from elsewhere. The coastal waters of Alaska sit right at the end of the ocean conveyor belt.”
Elsewhere, acidification is already having a serious impact on fishing and shellfish industries.
Oysters dying
The New York Times reports that billions of baby oysters—known as spat—are dying off the coast of Washington state in the north-western U.S.
In May this year, the U.S. government’s major report on climate change, the National Climate Assessment, said that waters off the north-west of the country are among the world’s most acidic.
Jay Inslee, Governor of Washington, says an industry worth US$270 million is at risk. “You can’t overstate what this means to Washington,” he says.
Inslee and many others in Washington state are fighting plans by the coal industry to build large coal ports in the region in order to export to China and elsewhere in Asia.
Climate scientists say greenhouse gas emissions resulting from coal burning are a main cause of global warming.
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