»Reduce, reuse, and ...

Today is a five-newspaper day: The Wall Street Journal (courtesy Aram), The New York Times, the San Francisco Independent, the venerated San Francisco Examiner, and the suitable-for-puppy-training San Francisco Chronicle. If I jump on CalTrain, I can also pick up a copy of the San Mateo Daily News. And what of all this newsprint? Almost two pounds that I'll haul back and forth, and then dump into a recycling bin.
Why do I prefer the newsprint editions of these 'papers, all of which are available (in some form) on-line? And why do I contribute to the consumption of our limited paper resources?