It's not easy being green

From the WSJ through MediaPost

Hotels Struggle With The Meaning Of Green
As more hotels try to become more environmentally friendly--in part to satisfy customers who are demanding it--they find themselves cluttered with "green" products and hype--but without many reliable guideposts for what's effective.

So - when you travel, what can hotels you stay at do to support your green-ness? Is it enough to not change bed sheets and towels every morning? How much are you willing to give up to be green in a hotel?

I find that housekeeping will often ignore the towel I have draped over the shower rod and will replace it anyway with a fresh towel.