Late last week, a Web site that claims that there is no scientific consensus on global warming published a leaked draft report on the impacts of global warming. The leak was apparently intended to embarrass the authors of the report, which is the latest installment from the Intergovernmental Panel on Climate Change. However, it seems mostly to have had the opposite effect: what the leaked document shows is just how dire the impacts are likely to be. The report was the lead story on the front page of Saturday’s Times, under the two-column headline ‘Climate Change Seen Posing Risk to Food Supplies.