Write an argumentative essay of around 2,500 words (excluding footnotes and bibliography) on one of the below topics. The theory/principle/issue/case etc. has to be international or global in nature. Topic 1: Immigration (definition of open and closed borders; refugees; brain drain; the human right to internal migration and emigration) Explain and assess Carens’s arguments for open borders. Topic 2: Just war and military intervention (just war theory; jus ad bellum; ‘responsibility to protect’) Under what circumstances is military intervention justified?