Jared Genser and Irwin Cotler provide a comprehensive overview on how this contemporary principle of international law has developed and analyze how best to apply it to current and future humanitarian crises. The "responsibility to protect" is a doctrine unanimously adopted by the UN World Summit in 2005, which says that all states have an obligation to protect their own citizens from mass atrocities, which includes genocide, war crimes, crimes against humanity, and ethnic cleansing. Its adoption and application has generated a passionate debate in law schools, professional organizations, media and within the U.N. system.