Gravestones Hold Secrets To Earth's Climate Past

EarthTrek draws upon the local citizenry to build global information databases. Here, Canadian student Pascal records data from a gravestone in Sydney, Australia, as part of the EarthTrek Gravestone Project. Credit: The Geological Society of America

From Live Science:

Gravestones may hold secrets of how the Earth's atmosphere has changed over the centuries, and scientists are now asking for the public's help to read these stones.

Little by little, atmospheric gases dissolved in raindrops cause the marble in gravestones to erode. As such, headstones can serve as diaries of changes in atmospheric chemistry over the years due to pollution and other factors.

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