He enrolled at the University of Buenos Aires, where he received a degree in architecture, and relocated to Paris with his wife, Blanca Isabel Álvarez de Toledo, in 1965.
Venturing into conceptual art, he mounted an acrylic display at the Iris Clert Gallery, creating an artificial garden that set a new direction for his work towards environmental activism.
[5] Between 1968 and 1970, he repeated the feat in New York's East River, the Seine, in Paris, and in Buenos Aires, initially at the mouth of polluted southside Riachuelo but carried out in the Rio de la Plata.
Remaining active in the city's tree-planting effort, he turned to portrait art and in 1993, was invited to the renowned Ruth Benzacar Gallery on Florida Street to present Utopía del Sur (Southern Utopia), a display devoted to his cause.
[7] During the final years while still active in his cause in Argentina, García Uriburu directed tree-planting efforts in neighboring Uruguay and organized protests over the unabated degradation of Buenos Aires' industrial Riachuelo waterway, jointly with Greenpeace.