the effluent from Chisso was not identified as the sought source. It took 9 more years until the government officially acknowledged mercury-containing effluent from local acetaldehyde chemical plants to be the cause of Minamata disease. Since then, victims of Minamata disease have been compensated by Chisso and both local and national governments, thanks to the lawsuits won and official relief programmes. The 1970 session of the Japanese Diet became remembered as the "Pollution Diet," as the Japanese government took action under the pressure of civil society movements provoked by Minamata disease as well as other two major environmental catastrophes - Yokkaichi Asthma and Itai-itai disease. Fourteen new environmental laws were passed in a single session, giving Japan what at the time were the most stringent environmental protection laws in the world. These new laws included a Water Pollution Act and nationwide regulations of toxic discharges. The "polluter pays" principle was introduced. A national Environmental Agency, which later developed into the Ministry of Environment, was founded in 1971. National governmental expenditures on environmental issues almost doubled between 1970 and 1975 and tripled on the local government level. Business investments in clean technologies rose dramatically, too. Minamata disease attracted global attention in 1972 during the United Nations Conference on the Human Environment held in Stockholm. The official report presented to the Conference by the Japanese government did not mention the disease at all; this lack of honesty resulted in a second report being put together by Japanese citizens. Minamata disease patients were sent to Stockholm to hand in the citizens' report. Evidence of the misery caused by heavy environmental pollution revealed the downside of Japan's post-war rapid economic development to the global public. In 1978, the National Institute for Minamata Disease was established in Minamata. It consists of four departments: The Department of Basic Medical Science, The Department of Clinical Medicine, The Department of Epidemiology and The Department of International Affairs and Environmental Sciences. In 1986, The Institute became a WHO Collaborating Centre for Studies on the Health Effects of Mercury Compounds. The Institute seeks to improve medical treatment of Minamata disease patients and conducts research on mercury compounds and their impact on organisms as well as potential detoxification mechanisms. In April, 2008 the Institute invented a method for adsorbing gaseous mercury in order to prevent air pollution and enable recycling of the metal. For an overview of research in 2012, see