Guardian: A LEADING climate scientist says the European Union and its international partners must urgently rethink targets for cutting carbon dioxide in the atmosphere because of fears they have grossly underestimated the scale of the problem. Dr James Hansen, head of the NASA Goddard Institute for Space Studies in New York, calls for a sharp reduction in carbon dioxide limits. Dr Hansen said the EU target of 550 parts per million of carbon dioxide – the most stringent in the world – …