What do the Great Wall of China, the Pyramids of Giza, and a swath of plastic greenhouses in southern Spain have in common? In Almería, an arid province hugging the Mediterranean coast of southeastern Spain, more than 40,000 hectares of reflective white plastic greenhouses now stretch across the desert-like plains. Credit: NASA Earth ObservatoryThe transformation is nothing short of radical. A team from the University of Almería found that the region’s surface reflectivity increased by nearly 10% over the same time span—a shift large enough to influence local microclimates. Credit: NASA Earth ObservatoryWhile some have pointed to this as a potential climate adaptation strategy, experts caution against reading too much into it.