Many chemicals are suspected as harmful to human health or the environment.
Mankind has synthesized many chemicals which nature does not recognize and to which it does not know how to react. The result can be that those chemicals bioaccumulate in nature and cause harm. It is difficult to estimate how many synthetic chemicals have been produced, but there are probably more than 100,000. Presently we only know about how about 1% of them impact on human health and the environment.
Chemicals have a different impact depending on their type, composition and the amount used.

Grafik: A symbol exclusively used for synthetic chemicals at \302\

Jan. 30, 2011
Finnur Sveinsson
Finnur Sveinsson „Tilbúin efni - viðmið“, Náttú Jan. 30, 2011 URL: [Skoðað:Oct. 24, 2021]
Efni má nota eða vitna í samkvæmt almennum venjum sé heimilda getið með slóð eða fullri tilvitnun hér að ofan.
skrifað: May 8, 2007
breytt: Jan. 30, 2012