Historical Mercury Pollution: Tree Rings Have the Receipts!

Mercury is a troublesome pollutant in the environment and while we know a lot more about where sources are today, we don’t know as much about where sources were in the past and how high pollution levels were. Luckily, trees can help us to figure that out! Using traces of mercury pollution stored in tree rings, scientists try to see how mercury pollution levels have changed as we’ve become more industrialized.

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Trees, Tempests, and Time: What trees can tell us about weather in the past

For storms along the Gulf Coast, first-person recordings are only reliable for the past 150 years. But knowing more about when storms happened in the past helps us understand how the climate is changing and how to reduce storm risks for coastal communities. To do that, we have to use even more unusual records: tree rings.

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