On April 22, International Mother Earth Day is celebrated, proclaimed by the United Nations as a result of a draft resolution proposed by Bolivia with support of more than 60 nations from all continents. “This decision is an acknowledgment that the Earth and its ecosystems sustain our lives. It also enhances our responsibilities to promote harmony with nature”, said the General Assembly on April 22, 2009, officially declaring this date.

Two significant events occurred in 1968: the US Public Health Service organized the Human Ecology Symposium, in which students from all over heard scientists speak about the effects of environmental degradation on human health; and the intervention of the United Nations, which through its main organs seriously considered environmental issues. But it is in 1970 when the first demonstration takes place: on April 22 of that year and promoted by senator and environmental activist Gaylord Nelson, two thousand universities, ten thousand schools and hundreds of communities participated and forced the US government to adopt a series of laws aimed at protecting the environment.

Today the United Nations, through its United Nations Environment Program, warns that “a new infectious disease emerges in humans every 4 months. Of these diseases, 75% come from animals. This shows the close relationships between human, animal and environmental health. Today, more than ever, we need a shift towards a more sustainable economy that works for both people and the planet.”