Ecosystems provide a variety of goods and services upon which people depend. The term ecosystem was first used in 1935 in a publication by British ecologist Arthur Tansley. Tansley devised the concept to draw attention to the importance of transfers of materials between organisms and their environment.
Addressing the risk of chemicals in the environment is becoming increasingly complex, a fact acknowledged by the society. There are many legislations and guidelines related to xenobiotics into the environment that coexist at present. Those rules impose or propose limits and cutoff values for chemicals, how they should be treated once released in the environment or which is the maximum value admitted before causing any harms for environment or population.