The Impact-Driven Approach to Sustainability add-on links to existing farm management systems to facilitate producers in collecting environmental farm data, such  as water/energy usage and fertilizers.
This data will be checked by certification bodies who audit the farms on a regular basis.
Via the linked farm management systems, GLOBALG.A.P. will also access the data to issue reports that are sent back to the farmer. The reports assist the farmer in monitoring their usage of key inputs. This information will help producers to save resources and thus continue on the path to more sustainable farming practices.

https://www.globalgap.org/uk_en/media-events/news/articles/New-GLOBALG.A.P.-Add-on-Offers-More-Choice-to-Floriculture-Producers/