Will Nations Embrace Opportunity to Reduce Black Carbon Emissions and Slow Arctic Warming?
By Martin Williams and Erika Rosenthal
Photo courtesy of Shutterstock
Arctic nations have an extraordinary opportunity to show global leadership to slow regional warming and melting by embracing a proposal to launch talks on an agreement to reduce emissions of the climate pollutant black carbon. Arctic environment ministers have the power to send a strong signal to the Arctic Council when they gather Feb. 5 and Feb. 6 in Jukkasjärvi, Sweden—only the second time ever—acknowledging black carbon reductions as a priority for regional environmental protection.
The Arctic is warming twice as fast as the rest of the planet. Last year was a record melt year for both summer sea ice and land glaciers, e.g. the Greenland Ice Sheet, with grave implications for Arctic peoples and biodiversity, and for low-lying nations and communities around the world. Scientists named 2012 the “Goliath melt year” observing melting on more than 90 percent of the mammoth Greenland Ice Sheet’s surface; sea ice retreated to half the size it was when measurements began in 1979.
While carbon dioxide (CO2) reductions remain the backbone of efforts to limit the long term consequences of climate change in the Arctic and globally, its 100-year atmospheric lifespan means CO2 reductions alone cannot avert further potentially devastating warming and melting in the Arctic in the near term. Rapid reductions in emissions of short-lived climate forcers, including black carbon, a component of fine particle pollution, and methane have been identified as the most effective strategy to slow warming and melting in the Arctic over the near term, giving the cultures and biodiversity of the region more time to adapt and slowing the rise of sea levels by reducing continental ice melting.
Arctic states have a special responsibility since black carbon is a more potent climate forcing agent when emitted from within or near the Arctic because particles have a greater chance of settling on Arctic ice and snow, amplifying warming and melting. A seminal paper published recently by a multinational team of scientists, Bounding the role of black carbon in the climate system, states that black carbon has “twice the climate impact reported in previous assessments" and ranks black carbon as the “second most important human emission …; only carbon dioxide is estimated to have a greater forcing …”
Black carbon reductions are important for health as well as climate. It is a component of fine particulate pollution that is emitted by diesel engines, residential wood heating and some industries, and is associated with over a million premature deaths each year from respiratory and heart disease.
The Convention on Long-range Transboundary Air Pollution (CLRTAP) has led the way. In May 2012 CLRTAP, of which all eight Arctic states are parties, became the first multilateral agreement to address black carbon. Amendments to the Convention’s Gothenburg Protocol establish emissions standards for fine particulate matter and urge Parties to “… seek reductions from those source categories known to emit high amounts of black carbon, to the extent it considers appropriate." These measures were adopted based on the recognition that reduction of black carbon will “… improve air quality, provide significant public health benefits, and provide regional climate benefits by protecting the Arctic and glaciated mountainous regions, in particular from accelerated rates of melting of ice, snow and permafrost.”¹
While groundbreaking, CLRTAP’s emissions ceilings don't apply until 2020 and the black carbon reductions goals are voluntary. Arctic nation leadership is urgently needed to complement and accelerate black carbon efforts under CLRTAP. The Arctic Council’s own work [Task Force] on SLCF and the UNEP Integrated Assessment have shown that black carbon actions by the eight Arctic nations—using available technologies and known practices—can have a significant temperature impact in the region. Time is of the essence—the UNEP assessment showed that emissions reductions before 2030 will have the greatest impact—and Arctic Council nations are better positioned to lead having studied science-based mitigation opportunities in two working groups for more than four years.
An Arctic regional agreement on black carbon, under the auspices of the Arctic Council, would be a much needed step to complement and advance implementation of commitments under CLRTAP, and do more in the region where it is most critical, both to protect the health and ecosystems in the Arctic, and to slow sea level rise. Logical, complementary steps for an Arctic nation instrument on black carbon could start with agreement to submit black carbon emissions inventories, based on CLRTAP guidelines soon to be finalized; to track regional trends and identify mitigation opportunities; and establish a mechanism for reporting and joint consultation on national mitigation action through the Arctic Council. Additional measures that should be considered for inclusion in a regional black carbon instrument include the adoption of a common, circumpolar vision for black carbon emissions reductions and the development of national mitigation action plans for black carbon. A mechanism for technology transfer and finance to facilitate enhanced mitigation action may also be appropriate.
Arctic nations took on a special commitment, in the founding declaration of the Arctic Council, for “… the protection of the Arctic environment, including the health of Arctic ecosystems, maintenance of biodiversity in the Arctic region and conservation and sustainable use of Arctic resources.” In recent years, the Arctic Council has become a platform for the negotiation of regional agreements to help fulfill that pledge, the first on Search and Rescue (2011) and the second, to be signed this year, on oil spill preparedness and response. A decision by the Council to launch negotiations on black carbon reductions in the Arctic would be a welcome complement to the advances under CLRTAP, and an important step for nations of the region to fulfill their commitments to protect the extraordinary peoples, biodiversity and ecosystems of the region. The time for Arctic nations’ leadership on black carbon is now.
Visit EcoWatch’s CLIMATE CHANGE page for more related news on this topic.
Martin Williams is a professor at King’s College London and serves as chair of the Executive Body of the Convention on Long-range Transboundary Air Pollution (CLRTAP). The article reflects his personal views only, not any policy of the CLRTAP. Erika Rosenthal is an attorney with the public interest environmental law firm, Earthjustice. Both participated in the UNEP Integrated Assessment of Black Carbon and Tropospheric Ozone.
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By Bob Jacobs
Hanako, a female Asian elephant, lived in a tiny concrete enclosure at Japan's Inokashira Park Zoo for more than 60 years, often in chains, with no stimulation. In the wild, elephants live in herds, with close family ties. Hanako was solitary for the last decade of her life.
Hanako, an Asian elephant kept at Japan's Inokashira Park Zoo; and Kiska, an orca that lives at Marineland Canada. One image depicts Kiska's damaged teeth. Elephants in Japan (left image), Ontario Captive Animal Watch (right image), CC BY-ND
Affecting Health and Altering Behavior<p>It is easy to observe the overall health and psychological consequences of life in captivity for these animals. Many captive elephants suffer from arthritis, obesity or skin problems. Both <a href="https://doi.org/10.11609/JoTT.o2620.1826-36" target="_blank">elephants</a> and orcas often have severe dental problems. Captive orcas are plagued by <a href="https://doi.org/10.1016/j.jveb.2019.05.005" target="_blank">pneumonia, kidney disease, gastrointestinal illnesses and infections</a>.</p><p>Many animals <a href="https://doi.org/10.1016/j.neubiorev.2017.09.010" target="_blank">try to cope</a> with captivity by adopting abnormal behaviors. Some develop "<a href="https://doi.org/10.1016/j.applanim.2017.05.003" target="_blank" rel="noopener noreferrer">stereotypies</a>," which are repetitive, purposeless habits such as constantly bobbing their heads, swaying incessantly or chewing on the bars of their cages. Others, especially big cats, pace their enclosures. Elephants rub or break their tusks.</p>
Changing Brain Structure<p>Neuroscientific research indicates that living in an impoverished, stressful captive environment <a href="https://doi.org/10.1016/j.jveb.2019.05.005" target="_blank" rel="noopener noreferrer">physically damages the brain</a>. These changes have been documented in many <a href="https://doi.org/10.1002/cne.903270108" target="_blank" rel="noopener noreferrer">species</a>, including rodents, rabbits, cats and <a href="https://doi.org/10.1006/nimg.2001.0917" target="_blank" rel="noopener noreferrer">humans</a>.</p><p>Although researchers have directly studied some animal brains, most of what we know comes from observing animal behavior, analyzing stress hormone levels in the blood and applying knowledge gained from a half-century of neuroscience research. Laboratory research also suggests that mammals in a zoo or aquarium have compromised brain function.</p>
This illustration shows differences in the brain's cerebral cortex in animals held in impoverished (captive) and enriched (natural) environments. Impoverishment results in thinning of the cortex, a decreased blood supply, less support for neurons and decreased connectivity among neurons. Arnold B. Scheibel, CC BY-ND<p>Subsisting in confined, barren quarters that lack intellectual stimulation or appropriate social contact seems to <a href="https://doi.org/10.1590/S0001-37652001000200006" target="_blank" rel="noopener noreferrer">thin the cerebral cortex</a> – the part of the brain involved in voluntary movement and higher cognitive function, including memory, planning and decision-making.</p><p>There are other consequences. Capillaries shrink, depriving the brain of the oxygen-rich blood it needs to survive. Neurons become smaller, and their dendrites – the branches that form connections with other neurons – become less complex, impairing communication within the brain. As a result, the cortical neurons in captive animals <a href="https://doi.org/10.1002/cne.901230110" target="_blank">process information less efficiently</a> than those living in <a href="https://doi.org/10.1002/dev.420020208" target="_blank">enriched, more natural environments</a>.</p>
An actual cortical neuron in a wild African elephant living in its natural habitat compared with a hypothesized cortical neuron from a captive elephant. Bob Jacobs, CC BY-ND<p>Brain health is also affected by living in small quarters that <a href="https://doi.org/10.3233/BPL-160040" target="_blank">don't allow for needed exercise</a>. Physical activity increases the flow of blood to the brain, which requires large amounts of oxygen. Exercise increases the production of new connections and <a href="http://dx.doi.org/10.1126/science.aaw2622" target="_blank">enhances cognitive abilities</a>.</p><p>In their native habits these animals must move to survive, covering great distances to forage or find a mate. Elephants typically travel anywhere from <a href="https://www.elephantsforafrica.org/elephant-facts/#:%7E:text=How%20far%20do%20elephants%20walk,km%20on%20a%20daily%20basis." target="_blank">15 to 120 miles per day</a>. In a zoo, they average <a href="https://doi.org/10.1371/journal.pone.0150331" target="_blank" rel="noopener noreferrer">three miles daily</a>, often walking back and forth in small enclosures. One free orca studied in Canada swam <a href="https://doi.org/10.1007/s00300-010-0958-x" target="_blank" rel="noopener noreferrer">up to 156 miles a day</a>; meanwhile, an average orca tank is about 10,000 times smaller than its <a href="https://www.cascadiaresearch.org/projects/killer-whales/using-dtags-study-acoustics-and-behavior-southern" target="_blank" rel="noopener noreferrer">natural home range</a>.</p>
Disrupting Brain Chemistry and Killing Cells<p>Living in enclosures that restrict or prevent normal behavior creates chronic frustration and boredom. In the wild, an animal's stress-response system helps it escape from danger. But captivity traps animals with <a href="https://doi.org/10.1073/pnas.1215502109" target="_blank">almost no control</a> over their environment.</p><p>These situations foster <a href="https://doi.org/10.1037/rev0000033" target="_blank">learned helplessness</a>, negatively impacting the <a href="https://doi.org/10.1155/2016/6391686" target="_blank" rel="noopener noreferrer">hippocampus</a>, which handles memory functions, and the <a href="https://doi.org/10.1016/j.neuropharm.2011.02.024" target="_blank" rel="noopener noreferrer">amygdala</a>, which processes emotions. Prolonged stress <a href="https://doi.org/10.3109/10253899609001092" target="_blank" rel="noopener noreferrer">elevates stress hormones</a> and <a href="https://doi.org/10.1523/JNEUROSCI.10-09-02897.1990" target="_blank" rel="noopener noreferrer">damages or even kills neurons</a> in both brain regions. It also disrupts the <a href="https://doi.org/10.1016/j.neubiorev.2005.03.021" target="_blank" rel="noopener noreferrer">delicate balance of serotonin</a>, a neurotransmitter that stabilizes mood, among other functions.</p><p>In humans, <a href="https://doi.org/10.1006/nimg.2001.0917" target="_blank" rel="noopener noreferrer">deprivation</a> can trigger <a href="https://doi.org/10.3389/fnins.2018.00367" target="_blank" rel="noopener noreferrer">psychiatric issues</a>, including depression, anxiety, <a href="https://doi.org/10.3389/fnins.2018.00367" target="_blank" rel="noopener noreferrer">mood disorders</a> or <a href="https://doi.org/10.1177/1073858409333072" target="_blank" rel="noopener noreferrer">post-traumatic stress disorder</a>. <a href="https://doi.org/10.1007/s00429-010-0288-3" target="_blank" rel="noopener noreferrer">Elephants</a>, <a href="https://doi.org/10.1371/journal.pbio.0050139" target="_blank" rel="noopener noreferrer">orcas</a> and other animals with large brains are likely to react in similar ways to life in a severely stressful environment.</p>
Damaged Wiring<p>Captivity can damage the brain's complex circuitry, including the basal ganglia. This group of neurons communicates with the cerebral cortex along two networks: a direct pathway that enhances movement and behavior, and an indirect pathway that inhibits them.</p><p>The repetitive, <a href="http://dx.doi.org/10.1016/j.bbr.2014.05.057" target="_blank">stereotypic behaviors</a> that many animals adopt in captivity are caused by an imbalance of two neurotransmitters, dopamine and <a href="https://doi.org/10.1016/j.neubiorev.2010.02.004" target="_blank" rel="noopener noreferrer">serotonin</a>. This impairs the indirect pathway's ability to modulate movement, a condition documented in species from chickens, cows, sheep and horses to primates and big cats.</p>
The cerebral cortex, hippocampus and amygdala are physically altered by captivity, along with brain circuitry that involves the basal ganglia. Bob Jacobs, CC BY-ND<p>Evolution has constructed animal brains to be exquisitely responsive to their environment. Those reactions can affect neural function by <a href="https://www.penguinrandomhouse.com/books/311787/behave-by-robert-m-sapolsky/" target="_blank">turning different genes on or off</a>. Living in inappropriate or abusive circumstance alters biochemical processes: It disrupts the synthesis of proteins that build connections between brain cells and the neurotransmitters that facilitate communication among them.</p><p>There is strong evidence that <a href="https://doi.org/10.1523/JNEUROSCI.0577-11.2011" target="_blank">enrichment</a>, social contact and appropriate space in more natural habitats are <a href="https://doi.org/10.1111/j.1748-1090.2003.tb02071.x" target="_blank" rel="noopener noreferrer">necessary</a> for long-lived animals with large brains such as <a href="https://doi.org/10.1371/journal.pone.0152490" target="_blank" rel="noopener noreferrer">elephants</a> and <a href="https://doi.org/10.1080/13880292.2017.1309858" target="_blank" rel="noopener noreferrer">cetaceans</a>. Better conditions <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5543669/" target="_blank" rel="noopener noreferrer">reduce disturbing sterotypical behaviors</a>, improve connections in the brain, and <a href="https://doi.org/10.1038/cdd.2009.193" target="_blank" rel="noopener noreferrer">trigger neurochemical changes</a> that enhance learning and memory.</p>