Atmospheric mercury levels have dropped nearly 70% since 2000, thanks to global policies targeting human-driven emissions, according to research published in ACS ES&T Air. The study, led by scientists including Yindong Tong, highlights the success of initiatives like the Minamata Convention on Mercury while underscoring the growing challenge of mercury re-emissions from soil due to climate change.
The research team analyzed mercury isotopes in the leaves of high-altitude plants on Mount Everest, which preserve historical atmospheric data like tree rings. Their findings show a sharp decline in human-caused mercury emissions from fossil fuel burning, waste incineration, and mining over the past 20 years. However, mercury re-emissions from soil, now accounting for 62% of total atmospheric mercury, have risen as climate change accelerates natural release processes.
“By tracking mercury pollution at the top of the world, we prove global efforts to reduce pollution are working,” said Tong, the study’s corresponding author. The results align with earlier reports of declining mercury levels across the Northern Hemisphere.
While the study confirms the effectiveness of policies like the Minamata Convention, it also calls for future strategies to address soil-based mercury re-emissions. As climate change intensifies, mitigating this growing source will be critical to sustaining progress in reducing global mercury pollution.
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