Is there an isotopic signature of the Anthropocene?

We consider whether the Anthropocene is recorded in the isotope geochemistry of the
atmosphere, sediments, plants and ice cores, and the time frame during which any changes are
recorded, presenting examples from the literature. Carbon and nitrogen isotope ratios have
become more depleted since the 19th century, with the rate of change accelerating after ~ad
1950, linked to increased emissions from fossil fuel consumption and increased production of
fertiliser. Lead isotope ratios demonstrate human pollution histories several millennia into the
past, while sulphur isotopes can be used to trace the sources of acid rain. Radioisotopes have
been detectable across the planet since the 1950s because of atmospheric nuclear bomb tests and
can be used as a stratigraphic marker. We find there is isotopic evidence of widespread human
impact on the global environment, but different isotopes have registered changes at different
times and at different rates.