"We should expect much more political destabilisation of countries as it bites," says Richard Choularton, a policy officer in the UN's World Food Programme climate change office. "What is different now from 20 years ago is that far more people are living in places with a higher climatic risk; 650 million people now live in arid or semi-arid areas where floods and droughts and price shocks are expected to have the most impact. (..) The Mary Robinson climate justice foundation is hosting a major conference in Dublin this week. Research to be presented there will say that rising incomes and growth in the global population, expected to create 2 billion more mouths to feed by 2050, will drive food prices higher by 40-50%. Climate change may add a further 50% to maize prices and slightly less to wheat, rice and oil seeds.