 Contemporary liberal theorists have traditionally argued that world government, in the form of a global leviathan with supreme legislative, executive, adjudicative and enforcement powers, is largely unnecessary to solve problems such as war, global poverty, and environmental catastrophe. World government so conceived is neither necessary nor sufficient to achieve the aims of a liberal agenda (Yack 2012). Even cosmopolitan liberals have not argued that moral cosmopolitanism necessarily entails political cosmopolitanism in the form of a world government.