here are some web sites
USDA -- http://www.ars.usda.gov/Main/docs.htm?docid=12462

NASA setup a ozone garden http://www.nasa.gov/centers/goddard/news/topstory/2006/ozone_garden.html

Tree huggers -- http://www.google.com/imgres?imgurl=http://i.treehugger.com/images/2007/10/24...