The environmental dimension of sustainability concerns the organization’s impact on living and non-living natural systems, including land, air, water and ecosystems. 

The GRI G4 Environmental Category covers impacts related to inputs (such as energy and water) and outputs (such as emissions, effluents and waste). In addition, it covers biodiversity, transport, and product and service-related impacts, as well as environmental compliance and expenditures.

(Source: Global Reporting Initiative)