Viewing a system as a whole and not merely a collection of parts

Explicit commitment
GENERAL
The environment vision | AHDB
The ethical foundations of sustainability | Nature Education
JOURNAL ARTICLES
Potential of voluntary sustainability standards to reduce detrimental agricultural impacts | PNAS
Actual commitment
GENERAL
Topics in sustainable agriculture | Agricultural Sustainability Institute
What is sustainable agriculture | Union of Concerned Scientists
Sustainability livestock production | EIP-AGRI
Assessment of progress
GENERAL
Sustainable livestock production in Europe | Knowledge for Innovation
Tools for monitoring and improving sustainability on farm | iSAGE
REPORT
Methodologies for assessing sustainability in farming systems | IntechOpen
SAFA guidelines | FAO
Sustainability in livestock farming | DEFRA