The article highlights the issue of water pollution caused by the process of changing crops in greenhouses. The current practice involves removing existing plants and introducing new cuttings, which results in the release of dirty water from the greenhouses. This dirty water can negatively affect water quality if it is not properly disposed of, often leading to a spike in water pollution during crop change periods. In an effort to address this problem, local water boards have introduced a new initiative called the 'crop change check'. This initiative aims to ensure that crop changes are carried out in a more sustainable way, with the goal of reducing water pollution and promoting environmental sustainability.