Agriculture has also exerted pressure on aquatic environments (rivers, lakes, wetlands and coastal zones), from increasing levels of livestock effluents and diffuse pollution through the use of chemicals in arable farming. Other issues include the genetic erosion of maize varieties, which show a loss of 80% of local varieties compared to the 1930s, and more recently possible contamination of domesticated landraces and wild relatives from transgenic maize (OECD, 2008). While agri-environmental payments are possible under PROCAMPO for soil and water conservation, for instance, farmers’ uptake of these payments has been limited.