Pollution is commonly understood as chemical or organic residues that harm other forms of life or unbalance ecosystems. The use has been extended by analogy to other harmful effects where excess or dissonance with the environment produces distortion, as in visual, sound or even cultural contamination. Pollution can come from human or natural sources. For example, sulfur dioxide, one of the causes of acid rain, comes naturally from volcanoes, lightning, forest fires, oceans and biological decomposition at the rate of 80-280 million tons per year, while that of human origin reaches about 70 million tons per year.
The visual contamination of advertising elements both in urban areas and on roads not only detracts from the landscape but also distracts or produces daze, lack of concentration and stress levels. Excessive lighting prevents stargazing and when it includes rapid variations in intensity and color designed to attract attention, it results in the aforementioned stun and stress. Noise also causes stress and, in many cases, damages hearing. The aggressiveness of advertising, political, news or moral messages, whether auditory or visual, stuns, stresses and offends people’s sensibilities.
A milestone in pollution occurred in 1956 when it was detected in marine species and fishermen in the bay of Minamata, Japan. It was methylmercury dumped down the drain at the Chisso chemical plant. Despite this, the government did not stop the pollution until 1968. We currently know of the enormous amounts of mercury that informal mining dumps into our waters and soils, and although the damage is not yet accurately quantified, the government has enough evidence to act. with more urgency and decision.
In the late 1960s acid rain from industrial emissions of sulfur dioxide in Great Britain, carried by the winds and precipitated in large quantities in Sweden, and destroyed forests and lakes. Hence, Sweden offered to organize the first UN conference on the environment in Stockholm in 1972. Since then they have been carried out every 10 years and, to the awareness of being globally jointly responsible for the environment, concern for the development of peoples has been added, reaching the fragile consensus called Sustainable Development.





