Scientists are warning that climate changes could spell disaster for dozens of developing countries as further political cracks appear in the Kyoto Agreement. In its latest study, the IPCC - the UN's top forum for assessing global warming - says climate change will adversely affect water and food supplies and human health, displacing tens of millions of people. The United Nations group was also highly critical of President George Bush for his controversial stance on global warming. The BBC's Linda Duffin reports