Quaternary geology is a field of geology that studies events dating back to 2.6 million years ago. Quaternary geology, in particular, studies the processes and deposits that evolved throughout the Quaternary, a period marked by glacial-interglacial cycles. Quaternary geology has evolved over time from being a subset of historical geology to being a distinct science. Quaternary geological investigations that necessitate the dating of rocks or sediments necessitate a diverse set of procedures for determining that age. Although radiometric dating has quickly acquired a popularity for Quaternary dating, chemical/biological traces, geomorphic, and relative dating have all been used in the past (also known as correlative dating). Quaternary geologists benefit from the preservation of time-dependent chemical or biological processes since they examine changes on the earth's surface up to the present. Environmental change is a term used to describe a change or disturbance in the environment that is caused by both human and natural ecological processes. Natural disasters, human meddling, and animal contact are all examples of environmental changes. The environmental change includes not just physical changes but other variables such as invasive species infestations. The growth of extreme weather conditions in many regions of the world, affecting the survival of sensitive species and habitats, demonstrates that global environmental change is a critical issue.