The countries of the world have dragged their feet so long on global warming that the situation is now critical, experts appointed by the United Nations reported Sunday, and only an intensive worldwide push over the next 15 years can stave off potentially disastrous climatic changes later in the century.
It remains technically possible to keep planetary warming to a tolerable level, the Intergovernmental Panel on Climate Change found, according to a report unveiled here. But even in parts of the world like Europe that have tried hardest, governments are still a long way from taking the steps that are sufficient to do the job, the experts found.
The report did find some reasons for cautious optimism. The costs of renewable energy like wind and solar power are now falling so fast that their deployment on a large scale is becoming practical, the report said.
