the carbon trust argue that a more robust approach is for businesses to go beyond simple volumetric measurement to assess the full range of water impact from all sites. its work with leading global pharmaceutical company glaxosmithkline (gsk) analysed four key categories: water availability, water quality, health impacts, and licence to operate (including reputational and regulatory risks) in order to enable gsk to quantitatively measure, and credibly reduce, its year-on-year water impact.