Specifically, he says:
* Denmark has used its taxes on gasoline to wean itself off foreign oil.The only problem I have with any of the above is that Friedman gives far too little emphasis to the fact that Denmark has only 5 million or so people, and that they are drilling offshore in the North Sea. He mentions that its a small country with North Sea oil, but it's a one-line throwaway.
* It has also used building and efficiency standards to that end.
* Lastly, it has aggressively expanded wind energy, not only domestically, but exporting such technology at a rate four times faster than the rest of its exports.
So I looked up Copenhagen's population on Wikipedia, and Copenhagen turns out to contain 1,835,371 people, or 33.5% of Denmark's total! So of course when your main city has a third of the country's population, you can have advantages in transit efficiency that much bigger countries cannot avail themselves of.
Friedman is dead on about the need for greater energy efficiency in this country. But when he advocates for $10/gallon gas as Denmark has, or using bicycles more to commute in-city as he claims 50% of Copenhagen's residents do, he's ignoring the obvious fact that not every aspect of Denmark's model is going to work here in this vast, sprawling country of ours.