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ITHACA, N.Y. – Wild fig tree rings offer a cheap method for tracking toxic atmospheric mercury, a byproduct of gold mining in the Global South, according to a new Cornell University study.

By examining mercury concentrations in tree rings, they concluded that some species could bear witness to illegal mining activities. For hundreds of years, the Amazon has been exploited for its gold.

Although annual tree rings can tell researchers when mercury levels began rising, they can’t necessarily offer precise locational directions to the illegal miners. At the same time, higher ...

Gerson added that using tree rings to measure mercury could be useful for monitoring progress toward the Minamata Convention on Mercury, an international agreement to address human-caused mercury ...

An international team of researchers has now examined tree rings of species native to the Peruvian Amazon to determine if trees could be used to show approximately where and when atmospheric mercury ...