Since consensus was reached on humanity's contribution to climate change through unsustainable economic growth, we, unfortunately, find ourselves in a period some have coined the 'Anthropocene' [from the Greek word Anthropos meaning human].
Since the turn of the century, sustainable alternatives for almost all aspects of the industry have been saught.
Very few of these alternatives have such diverse proven benefits spanning from environmentally-friendly industrial consumables right through to healthcare and biofuels. The list is extensive.
Examples from the literate on potential therapeutic applications
1> Sun, Jidong; ,D-Limonene: safety and clinical applications,Alternative Medicine Review,12,3,259,2007,Thorne Research Inc.
2> Crowell, Pamela L; Gould, Michael N; , Chemoprevention and therapy of cancer by d-limonene, Critical Reviews™ in Oncogenesis,5,1,,1994,Begel House Inc.
3> Vigushin, David M; Poon, Grace K; Boddy, Alan; English, Jacqueline; Halbert, Gavin W; Pagonis, Christos; Jarman, Michael; Coombes, R Charles; Cancer Research Campaign Phase I/II Clinical Trials Committee; ,Phase I and pharmacokinetic study of D-limonene in patients with advanced cancer,Cancer chemotherapy and pharmacology,42,2,111-117,1998,Springer
4> Crowell, Pamela L; Ayoubi, A Siar; Burke, Yvette D; , Antitumorigenic effects of limonene and perillyl alcohol against pancreatic and breast cancer, Dietary Phytochemicals in Cancer Prevention and Treatment,,,131-136,1996, Springer
5> Crowell, Pamela L; Elson, Charles E; Bailey, Howard H; Elegbede, Abiodun; Haag, Jill D; Gould, Michael N; , Human metabolism of the experimental cancer therapeutic agent D-limonene, Cancer chemotherapy and pharmacology,35,1,31-37,1994, Springer
6> Miller, Jessica A; Thompson, Patricia A; Hakim, Iman A; Chow, H-H Sherry; Thomson, Cynthia A; ,d-Limonene: a bioactive food component from citrus and evidence for a potential role in breast cancer prevention and treatment, Oncology Reviews,5,1,31-42,2011, Springer
7> Gould, Michael N; Cancer chemoprevention and therapy by monoterpenes.,Environmental Health Perspectives,105,suppl 4,977-979,1997,
8> Park, Hyo Min; Lee, Ji Hae; Yaoyao, Jia; Jun, Hee Jin; Lee, Sung Joon; ,"Limonene, a natural cyclic terpene, is an agonistic ligand for adenosine A2A receptors", Biochemical and Biophysical Research Communications,404,1,345-348,2011, Elsevier
9> Herz, Rachel S, "Aromatherapy facts and fictions: a scientific analysis of olfactory effects on mood, physiology, and behavior", International Journal of Neuroscience,119,2,263-290,2009, Taylor & Francis