I just learned about this band from motherjones.com.
Meet The Duhks, pronounced like 'ducks.'
"... the band—which spends 75 percent of their time on the road—has invested in a biodiesel van to reduce their environmental footprint.... The band is also spreading their message through Green Duhks, their sustainability project. Environmentally-minded fans can join the “Flock” and support The Duhks Sustainability Project by purchasing a “very limited edition original art poster” printed with recovered ink on 100% recycled paper."
And some video: