As EU leaders prepare to make unprecedented commitments to cut greenhouse-gas emissions at a summit this week, divisions have emerged over whether to recognise nuclear as a low-carbon source, alongside wind power and other 'green' energies. EU heads of state and governments are set to endorse a 'unilateral' goal to slash greenhouse-gas emissions by 20% by 2020 compared to 1990 at a summit in Brussels on 8-9 March, a target which would eventually be raised to 30% should other developed nations such as the United States take similar steps.