The print Yellow Pages of course. Channel 2 News in Reno, NV (link) offers this insight:
If you are looking for ways to go green, look no further than your phone book.
In all the yellow pages, you will find a 32 page guide with tips on how to become more environmentally friendly.
They include everything from where to recycle things like paper and plastic to information on the Lockwood Landfill. “Whether you want your phone books or not, everyone gets one so they are good information and you can also find information on illegal dumping,” said Maia Dickerson with Keep Truckee Meadows Beautiful.
AT&T through its Southwestern Bell Telephone Company (company name it still operates under in the state of Missouri) has filed for permission with Missouri regulators to stop delivering the residential white pages book to homes in the Kansas City and St. Louis areas…
AT&T noted as it has in other markets where they and other publishers have filed similar requests (here and here) customers are not using the printed white pages as much to find telephone numbers. Instead, other methods including using the Internet are preferred. If approved, the phone company will mail a copy to customers that request one. The Yellow Pages will continue to be published and will include business white pages as of now.
The changes are not final yet — the Missouri Public Service Commission still has to approve the request.