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I like the idea, may be we could try and see of we can get a sponsor to provide us with some water coolers/despensors for the confrance. Instade of everyone buying bottled water... I have an old contact I will see if I can get his compny to sponsor us...
1) Follow the virgin blue model and offer to carbon offset their participation at the conference by adding a small fee. The money raise from the fee can be used to plant tree or donate to an appropriate carbon offsetting group.
2) Bring your own mug. It's a well known fact that most designers and especially developers live on coffee. Reusing a mug and rinsing it after use has less of a carbon foot print impact that using the disposable paper cups.
3) All of those goody bags that you get at these conferences, well, make sure they're not plastic and that they are reusable.
4) reduce the amount of paper used at the conference. Offer all of the slides and presentations to ticket holders so they can download them on to their laptops and pocket PC for the event rather than having piles of printed programmes and slides.
5) offer recycle bins at the event. make sure people can dispose of rubbish properly.