http://geovantage.com/applications/precision-agriculture/

Davidson, Robert. "Aerial Photographs - Advantages and Disadvantages Compared to Maps." Aerial Photographs - Advantages and

Ecology. Wilmington, MA: Great Source Education Group, 2005. PDF. Web.

http://www.esa.org/esa/documents/2013/03/issues-in-ecology-issue-1.pdf

"What Would Happen If the Oxygen Level on Earth Decreased by 75%? How Would the Environment Change and How Would Human and Animals Cope?" What Would Happen If the Oxygen Level on Earth Decreased by 75%? How Would the Environment Change and How Would Human and Animals Cope? - Quora. N.p., n.d. Web. 10 Mar. 2017.http://www.fao.org/soils-2015/news/news-detail/en/c/279235/

https://www.quora.com/What-would-happen-if-the-oxygen-level-on-earth-decreased-by-75-How-would-the-environment-change-and-how-would-human-and-animals-cope

Citations