Environmental proxies, as methods, refer to indirect measurement techniques that infer past or present environmental conditions from quantifiable properties of natural archives or materials. These methods utilize calibrated relationships between proxy variables (e.g., stable isotope ratios, elemental compositions, microfossil assemblages, growth rings, or sedimentological characteristics) and target environmental parameters such as temperature, salinity, precipitation, or biogeochemical cycles. Environmental proxy methods involve rigorous sampling protocols, laboratory analyses, statistical calibration against instrumental or observational datasets, and uncertainty quantification, enabling reconstruction, monitoring, or comparison of environmental states where direct measurements are unavailable or impractical.
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