While Al Gore and the IPCC received the Nobel Peace Prize in Oslo, negotiators continue to meet in Bali at the UN climate talks. The Guardian newspaper reports the negotiations hit a potential problem today when the United States said it was unwilling to approve a draft agreement setting firm targets for cuts to carbon pollution. The Bush administration said a proposal for developed nations to reduce emissions by between 25 and 40 percent by 2020 was “totally unrealistic” and “unhelpful.” The 25-40 percent figure is based on the work of the UN’s Intergovernmental Panel on Climate Change. Harlan Watson, the senior climate negotiator for the US said the IPCC calculation was based on “many uncertainties.”