Why does migration frighten so many of us? HARDtalk speaks to writer Mohsin Hamid whose novels have explored cultural, economic and religious tensions between East and West. Globalisation is a trend based on movement - of money goods, ideas and people - across continents and national borders. In a world of glaring inequality, it has stirred a powerful backlash manifested in the rise of nationalism and identity politics. This clash of human impulses is fertile territory for the Pakistani novelist.