RIO DE JANEIRO, BRAZIL - The Atacama Desert in northern Chile is one of the driest places on earth; it has seen no rain at all in years.
The water shortage was addressed using water from oases and complex irrigation systems. For soil nutrients, the solution they hit upon – centuries before the arrival of the Inca in around 1450 – was to bring a super-fertilizer from the coast in the form of seabird excrement, or “guano”..
This was the key finding of a new research in which the remains of 246 crop and wild plants found in 14 archaeological sites in . . .