of the earliest work defining a human right to water. In the 20th century, the early focus of human rights laws were on political and civil rights protected by the 1948 Universal Declaration of Human Rights. By the 1960s, however, scholars and human rights experts were calling attention to economic, social, and cultural rights as well, with the 1966 covenant on International Covenant on Economic, Social and Cultural Rights (ICESCR). While neither of these declarations addressed water, by the 1990s, there was growing concern about the failure to provide safe water and sanitation for hundreds of millions, and scholars were calling for explicit recognition of a human right to water. Two early efforts to define the human right to water came from law professor Stephen McCaffrey of the University of the Pacific in 1992 and Gleick in 1998. McCaffrey stated that "Such a right could be envisaged as part and parcel of the right to food or sustenance, the right to health, or most fundamentally, the right to life. Gleick added: "that access to a basic water requirement is a fundamental human right implicitly and explicitly supported by international law, declarations, and State practice.” A 1996 paper from Gleick argued for defining and quantifying a basic water requirement of 50 liters of water per person per day for drinking, cooking, cleaning, and sanitation, and the United Nations cited this work in General Comment 15, drafted in 2002, which provided their clearest definition of the human right to water to that point United Nations Committee on Economic, Social and Cultural Rights in General Comment 15 drafted in 2002. General Comment 15 was a non-binding interpretation that access to water was a condition for the enjoyment of the right to an adequate standard of living, inextricably related to the right to the highest attainable standard of health, and therefore a human right. It stated: "The human right to water entitles everyone to sufficient, safe, acceptable, physically accessible and affordable water for personal and domestic uses." In 2010, the UN General Assembly formally adopted the human right to water and sanitation in General Assembly Resolution 64/292 on 28 July 2010. That Resolution recognized the right of every human being to have access to sufficient, safe, and affordable water for personal and domestic uses. In September 2010, the UN Human Rights Council adopted a resolution recognizing that the human right to water and sanitation