The duration of the environmental study is the total time from its start to its end. For the study that began in 2015 and concluded in 2020, the duration is calculated as five years.

Duration of the Environmental Study (2015-2020)

A specific environmental study, referred to in a given context, was initiated in 2015.

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Environmental Studies is a multidisciplinary study that incorporates concepts from the physical sciences, economics/commerce, the humanities, and social sciences.  It studies the environment and the human impact on the environment.  

Environmental Studies

Reference of Foundations of Large Language Models Course

https://en.wikipedia.org/wiki/Environmental_studies#cite_note-1

Definition of Environmental Science

Environmental Justice, as defined by the EPA, is the fair treatment and meaningful involvement of all people regardless of race, color, national origin, or income, with respect to the development, implementation, and enforcement of environmental laws, regulations, and policies. 

Environmental Justice

Human survival and economic activity are fundamentally dependent on the natural world. The environment, encompassing both the physical surroundings and the biosphere (all life on Earth), serves a dual purpose: it provides the direct essentials for life, such as air, water, and food, and it supplies the raw materials like wood, metals, and oil used in the production of goods.

Economy and the Environment

Commencement of an Environmental Study in 2015

Determining the conclusion date of an environmental study is a fundamental step required to analyze its total duration and overall timeline.

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