Global IssuesMercury Pollution: A Global Threat to Oceans and Communities
BAKU, Nov 19 (IPS) - Mercury pollution from burning coal is contaminating our oceans and seafood, threatening global health.
Dr. Amina Schartup, a marine chemist at the Scripps Institution of Oceanography, has spent nearly 20 years studying the mercury cycle. Her research sheds light on how this heavy metal, released through industrial activities like coal burning, affects ecosystems and people worldwide.
"Mercury is released into the environment through various industries, with coal burning being a major source," she explains. The problem goes beyond carbon dioxide (CO2) emissions, as mercury travels globally, settling in places as remote as the Arctic and high mountains.
When mercury reaches the oceans, it is transformed by microbes into methylmercury, a highly toxic form. "This form accumulates in seafood, especially in larger predatory fish like tuna and swordfish, which many humans consume," Schartup says. This poses serious health risks, including developmental issues in children and cardiovascular problems in adults.
How Widespread Is Mercury Exposure?
Fish consumption is the primary way mercury enters the human body. According to Schartup, "If 3 billion people rely on seafood, then 3 billion people are exposed to mercury through fish."
The health impacts, however, are complex.
"Fish consumption is generally healthy, supporting brain development, but consuming too much fish with high mercury levels can offset those benefits," she notes. This makes balancing seafood consumption tricky, especially for communities heavily dependent on it.
Mercury exposure is a chronic issue, with small amounts accumulating in the body over time. The toxic effects, especially on fetal development, can result in reduced IQ and other developmental problems.
Mercury and Climate Change: A Dangerous Mix
Climate change intensifies mercury's impact on oceans and seafood. Schartup explains, "The mercury cycle is connected to the environment, so any changes—like rising temperatures or melting sea ice—will affect it."
For instance, warming oceans change the behavior of fish and microbes. "Warmer waters can cause fish to eat more, which increases their mercury levels," she says. Melting sea ice, which acts as a cap on the ocean, alters mercury exchange between the air and water. Freshwater inputs from melting glaciers or rivers also bring more mercury into the oceans.
These factors combine to make mercury levels in seafood even more unpredictable, creating additional challenges for public health.
Global Pollution, Local Consequences
One of the most alarming aspects of mercury pollution is its global reach. Once released into the atmosphere, mercury can travel thousands of miles before settling. "It can deposit in pristine areas like the Arctic, far from the emission sources," Schartup explains.
Microbial activity in different environments determines where mercury is transformed into its toxic form. "It happens everywhere," she says, emphasizing that no region is immune to this problem.
What Needs to Change?
At COP29, Schartup is advocating for a broader understanding of how emissions impact the environment and human health. "Climate change isn't just about CO2. Burning coal also releases mercury, which contaminates fish and affects the health of millions," she says.
Reducing coal usage could address both carbon and mercury pollution.
"By solving the CO2 crisis, we can tackle mercury contamination as well. This isn't just about climate; it's about health too," she stresses.
Schartup believes this issue should resonate with everyone, especially those who eat fish regularly. "Turning on the light switch is linked to mercury in the fish we eat. It's all connected," she explains.
Protecting Vulnerable Communities
Some populations are more affected than others, particularly those relying heavily on seafood. These communities face a double burden: the health risks from mercury and the challenges of adapting to climate change.
Schartup emphasizes the need for policies to protect these vulnerable groups. Reducing coal emissions and investing in cleaner energy sources could lessen mercury pollution and its far-reaching effects.
A Call to Action
Mercury pollution is a hidden crisis, but its effects on human health and the environment are profound. Schartup's research underscores the urgency of addressing this issue as part of global climate action.
"We have a chance to solve multiple problems at once," she says. Reducing coal emissions won't just cut CO2; it will also protect our oceans, seafood, and health.
This interconnected approach, she believes, is key to creating a sustainable future for all.
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