World Poverty and Human Rights

In World Poverty and Human Rights, Thomas Pogge says that it is a mistake to assume, as so many do, that severe poverty is due to exclusively to local causes. What  are the causes of poverty, according to Pogge?  Who, or what, is responsible for severe poverty What examples does Pogge draw on to vindicate his argumentIn  Thomas Pogge draws a distinction between positive and negative duties.  What, exactly, is the difference to these two sets of duties How does Pogge’s philosophical argument about duty relate to his political argument about inequality?