When it comes to acid rain or oil spills or depleted fisheries or tainted groundwater or fluorocarbon propellants or radiation leaks or sexually transmitted diseases, national frontiers are simple irrelevant. Toxins don't stop for customs inspections and microbes don't carry passports. North America became a water and free-trade zone long before NAFTA loosened up the market in goods.

The question to ask is not whether you are a success or a failure, but whether you are a learner or a nonlearner.

When it comes to acid rain or oil spills or depleted fisheries or tainted groundwater or fluorocarbon propellants or radiation leaks or sexually transmitted diseases, national frontiers are simple irrelevant. Toxins don't stop for customs inspections and microbes don't carry passports. North America became a water and free-trade zone long before NAFTA loosened up the market in goods.

The real lesson of 9/11 that I think we have still to learn is that this is a world of interdependence, in which all of the challenges of environment and climate change, of jobs, of disease, of war and terrorism, are cross-border problems that cannot be met one nation at a time.

Civility is a work of the imagination, for it is through the imagination that we render others sufficiently like ourselves for them to become subjects of tolerance and respect, if not always affection.

Having created the conditions that make markets possible, democracy must do all the things that markets undo or cannot do.

9/11 was a signal that we were living in a new world - a world of interdependence, a world in which people could attack the United States not from the outside, but from the inside. It was a sign that the United States, the most powerful country in the world, could watch the cathedral of capitalism at the Trade Center and the heart of its defense at the Pentagon be struck internally, not really across borders, so that borders don't matter anymore.