World at One - 23/04/2009

National and international news with Martha Kearney. The chairman of the Environment Agency, Lord Smith, discusses the government's plans for a new generation of coal-fired power plants. The carbon dioxide created by the power stations would be stored underground in an effort to combat climate change. Plus a closer look at the details of the Budget, in particular the prospects for public spending in health and education, and the latest news from the South African general election.