Resource Taxation is the big "green idea" which is not making much headway because of vested interests enjoying tremendous economic benefit from private control of natural resources.
Currently, most taxation is levied on human labour or on the value human labour adds to natural resources. The green idea is to levy a charge on accessing (and often depleting or spoiling) nature-given resources.
Shifting the tax burden off human enterprise would remove the arbitrary penalty that now attaches to employing human labour. A somewhat perverse result is that it is often more economical to invest in new machinery or increase energy use than to take on more workers.
The Green Economics Primer at http://www.earthrights.net/vision.html#primer includes a 14 point list of Green Economics Principles.
(I am reluctant to reinvent the wheel, but appreciate that it helps if readers don't have to plough throught yet another website in order to understand what I am trying to say :-)