TL9000 - 9.1.3.C.3 - Sustainability Assessment

Could you please suggest some ideas to meet this requirement for TL9000 rev.6.0?
It is not so clear why they use "should" in the standard.

The organization should assess the status of its sustainability
efforts as appropriate to its organization, products, and services.

9.1.3.C.3–NOTE A sample sustainability assessment model is available at

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