As world leaders gather this week to address the United Nations General Assembly, President Bush's refusal to negotiate on the two key issues of our day - war and global warming - has been stunning. And the media hasn't helped. Focusing on whether Columbia University should have invited Iran's President Ahmadinejad to speak, the Bush administration's drumbeat for war with Iran goes unchallenged. Let this not be a reprise of the war on Iraq.Former Federal Reserve Chairman Alan Greenspan says in his new memoir: "I am saddened that it is politically inconvenient to acknowledge what everyone knows: The Iraq War …