That the U.S. Postal Service promotes junk mail shows how deep corporate control over the U.S. government is.  When this agency can't even deliver real mail reliably, how dare it promote junk mail!  And, BTW, every mail carrier I've talked to hates junk mail, because it makes their jobs much harder.

As to so-called environmental groups, the two named here are two of the most conservative.  Any group that does not oppose junk mail in order to save trees and reduce oil consumption and burning is not worthy of being called an environmental group.

...we have an industry openly admitting it represents nothing but a make-work corporate welfare program.

As for environmental groups worried about their own mailings (which does open them up to charges of hypocrisy - I suppose they could rely more on the phone and internet), the answer seems simple. You could just have the do-not-mail registry differentiate between commercial and political mailings, as the do-not-phone registry does.
Anyway, I doubt such a mailing registry would be constitutional where it comes to political speech. I'm not even sure about commercial mailings. Print is treated more protectively than more "advanced" forms of technology.

It's disgusting that groups are opposing the Do Not Mail registry.  I remember well the brouhaha that ensued when the do not call registry was started. It is a great success.  In my state only certain non-profit and charitable groups can call my phone and only during certain hours.  It's great.

They do not have the right to call my phone as a matter for free speech and the same should apply to the printed matter in my mailbox.

Fortunately I use a P.O. Box and fortunately the local Post office supplies a wasted basket next the boxes.  About 90% of the incoming is a total waste.

Early on in my enviro-education, I was a member of NRDC. After a year of receiving multiple letters & bulletins each week, asking for $$, telling us of their fight or plight, I stopped.  I requested only email, but they could not accommodate the request. How can one support a group that is sending me more paper than Macy's?  

I like grist because it does not fill my trash with paper that I cannot recycle in this town anyway!  

As for the Do Not Mail registry, they would find some way around it.  Just like politicians find a way around the Do Not Call registry.    

Well at least now I know why so many of the catalogs I opted out of on Catalog Choice show up as unconfirmed. 4 confirmed, 57 unconfirmed and 3 refused. I was very disappointed then Title Nine and Territory Ahead refused my requests through them.

I do find it ironic NWF helped to create it b/c I know all of my membership to them for the year I belonged had to have been used on mailings of asking for more money, calendars, address labels, gift bags, wrapping paper, etc. After 3 months I finally asked them to cease and desist, send me e-mails and relented.

I wrote:

"Fortunately I use a P.O. Box and fortunately the local Post office supplies a wasted basket next the boxes."

It's not a waste(d) basket, it is a recycling bin with instructions as to what is acceptable.  The Post Office wants the money for third class even though they know we don't want it.  Some of it is in  circulation less than 30 seconds.