Sustainability and ESG: What We Measure and Why

Start with the right question: what are we trying to understand?

Sustainability is not one number and it is not a synonym for an annual report. In this diploma we use it as a way to understand whether an organization or activity can endure and create value while considering its effects on the environment and people, its dependencies on resources and relationships, and sustainability-related risks and opportunities that can influence decisions. ESG—environmental, social and governance—is an organizing lens. Energy and emissions are primarily environmental; worker safety and human rights are primarily social; accountability, controls and oversight are governance matters. The lens is useful, but the categories are not isolated and a high ESG score by itself does not prove that an organization is “sustainable.”

It helps to separate three questions. First, what impacts does the organization cause or contribute to for people or the environment? Second, what does the organization depend on, such as water, worker skills or customer trust? Third, what risks and opportunities may arise for the organization itself from those matters? One issue can operate in more than one direction. Water scarcity can harm communities or ecosystems while also raising costs or threatening continuity for a facility that depends on water. Keeping these questions separate avoids two common errors: reducing sustainability to “whatever affects profit,” or assuming that every external impact is automatically a financially material risk to the organization.

Measurement serves a question; it does not replace it

A useful metric answers a defined question within clear boundaries. An electricity-use number without sites, period and unit may be impossible to compare. An injury rate without stating who is in the denominator or whether contractors are included may give an incomplete picture. A promise to “reduce impact” without a baseline or time-bound target does not support assessment of progress. Connect each metric to a decision question: what do we need to know, what organizational or operational boundary applies, what period is covered, where does the data come from, and who checks that the definition remains consistent over time?