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We look at the climate change debate ahead of a key United Nations Summit taking place in New York. Scientists say that global temperatures are rising faster than ever as a result of increased carbon emissions, and yet top leaders from some of the most polluting countries are not even bothering to come to the meeting. So what are the prospects for binding initiatives to cut greenhouse gases? Is it too late for meaningful change? And what does big business really want in all this - cuts to carbon, or simply more business as usual? We hear from Peter Damsgaard Jensen, chief executive of the Danish Pension Fund, PKA, and one of the leading members of a worldwide lobbying body, The Institutional Investors Group on Climate Change. And we hear from one of the UN's top climate scientists, Jean-Pascal van Ypersele, vice-chair of the Intergovernmental Panel on Climate Change, on how close are we to meeting current targets to limit global warming.