forest for all time. Parliament may enact environmental legislation to ensure sustainable use of natural resources, maintain intergenerational equity, and reaffirm the sovereign rights of the State over its own biological resources. Parliament may also declare any part of the country to be a National Park, Wildlife Reserve, Nature Reserve, Protected Forest, Biosphere Reserve, Critical Watershed and such other categories meriting protection. Citizenship The Constitution provides three categories of citizenship. First, "natural born citizens" are children of two citizen parents. This is an ambilineal jus sanguinis citizenship law. Second, "citizens by registration" are those who can prove domicile in Bhutan by December 31, 1958 by showing registration in the official record of the Government of Bhutan. Third, "citizens by naturalization" are those who have applied for, and were granted, naturalization. Naturalization requires applicants to have lawfully resided in Bhutan for at least 15 years; have no record of imprisonment for criminal offences within the country or outside; can speak and write Dzongkha; have a good knowledge of the culture, customs, traditions and history of Bhutan; and have no record of having spoken or acted against the Tsawa-sum. They must also renounce the citizenship, if any, of a foreign State on being conferred Bhutanese citizenship; and take a solemn Oath of Allegiance to the Constitution as may be prescribed. The grant of citizenship by naturalization takes effect by a Royal Kasho (written order) of the King. The Constitution prohibits dual citizenship. If citizens of Bhutan acquire another citizenship, their Bhutanese citizenship is terminated. The Constitution confers the power to regulate all matters relating to citizenship to Parliament, subject to the Citizenship Acts. Fundamental rights The Constitution, in Article 7, guarantees a number of Fundamental Rights, variously to all persons and to citizens of Bhutan. All the citizens of Bhutan have the right to life, liberty and security of person and is not deprived of such rights except in accordance with the due process of law. All persons in Bhutan have the right to material interests resulting from any scientific, literary or artistic production of which he or she is the author or creator. All persons are equal before the law and are entitled to equal and effective protection of the law. They must not be discriminated against on the grounds of race, sex, language, religion, politics or other status. (Cf. American Equal Protection Clause). All persons are guaranteed freedom from torture