How much trash does a “green” event produce? Evidently, a lot if you’re the U.S. Green Building Council’s GreenBuild 2007. The annual conference, held in Chicago last year, created 44 tons of waste.

Granted, 91 percent of it - or 40 tons -  did not end up in the landfill, according to Dan Bulley, chair of the Volunteer Committee for Greenbuild in 2007. Instead 300 college students sorted through the waste.

Of the 40 tons of waste diverted, Bulley said seven tons were food scrap, and six tons were wood from expo displays in the exhibit hall.

What’s 40 tons of waste? For people around Seattle, it’s all the dog droppings left in Snohomish County over two days. For out of towners, it’s 260,000 items that washed up on New Jersey’s beaches over a year. For the U.S., it’s on the low end of the total waste a person produces in a year.

When you rationalize the numbers out, the mass waste makes some sense…. it was a week long conference and expo with an exhibit hall and 25,000 participants, so Bulley says it works out to about 3.5 pounds of waste per person (nevermind most people only stayed three days but we’ll go with it….).

But does mass waste ever make sense? The diversion fact is commendable. And the image of college students rifling through my waste (yes, I was at GreenBuild) is something to ponder. But did that 44 tons of waste need to be created in the first place?

Think about it… thousands of people gathering together to figure out how to save the environment and how to build green. And yet they still can’t not use things. 44 tons of things. Thrown away. Isn’t green building all about the idea that the little things - like 44 tons of waste - matter?

No wonder right wing talk show hosts call greenies hypocrites.

Remembering back, the hefty 187-page program could have been …. digital! Or it could have been easier to compost food scraps, or recycle nametags.  Those participating in the expos could have used less literature or cards that pointed attendees to a Web site.

Or, as a green building consultant said to me the other day, the entire conference could have been virtual. If 44 tons of trash sounds like a lot, imagine the carbon emissions from the millions of miles of air travel. (I for one met people from the U.K, Japan, Canada….)

This is by no means an isolated event, just a high profile one. But it seems to me an example of the kinks, shall we say, in the green building movement. Do I have something here or is it too much to think that people promoting green … could change the way they do things? It’s like not seeing the forest for the trees (that were at least, diverted).

For more, Building Design + C0ntruction runs the full press release here. FrontBurner asks if green trash is still green here. Or in another scenario from Wired Magazine here, Brandon Keim explores a Japanese city that just stopped waste collection. Now there’s an idea.