  12/29/2015 Plasticulture Almeria, Spain 36.715441373°, -2.721484966°   Here’s another favorite Overview from 2015. Greenhouses - also known as plasticulture - cover approximately 20,000 hectares of land (more than 75 square miles) in Almeria, Spain. The use of plastic covering is designed to increase produce yield, increase produce size, and shorten growth time. For a sense of scale, this Overview shows roughly eight square miles.