Endnotes
1. Wikipedia contributors, "Joseph Priestley". Wikipedia. The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Joseph_Priestley&oldid=306393137
2. The Columbia Encyclopedia, "Photosynthesis". Sixth edition. 2008, Columbia University Press
3. Wikipedia contributors, "Compost". Wikipedia. The Free Encyclopedia, 2009, http://enwikipedia.org/w/index.php?title?title=Compost&oldid=306332946
4. Wikipedia contributors, "Ecological Foot print". Wikipedia. The Free Encyclopedia. http://en.wikipedia.org/w/index.php?title=Ecological=footprint&oldid=3073433073
5. Merriam-Webster. Visual Dictionary Online, Plants & Gardening "Plants". 2009 www.merriam-webster.com
6. Touch stone kids "Teacher Zone".2009, www.touchstonekids.com
7. American Lung Association, "Air Quality".2009, www.Lungusa.org
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