Rural lands are cooler than urban spaces; a study suggests a new way to reduce sizzling urban temperatures

The heat is on cities to do something about sweltering and unhealthy urban temperatures. Researchers looked at the problem and said, "Rural can cool," and began work on configurations where city heat could be mitigated by country cool, reports Erin Blakemore of The Washington Post. "Rural land surrounding urban areas could reduce city temperatures by up to half a degree Celsius, an analysis in Nature Cities suggests, hinting at a way to cool increasingly scorching urban areas."

Scientists studied 30 cities in China "to understand how rural land cover affects urban heat islands — a phenomenon in which cities become significantly warmer than the areas surrounding them." Blakemore explains. "Researchers concluded neighboring rural land cover can explain about 30 percent of such regions’ effect on urban heat. . . . Air warms in cities, leaving a low-pressure zone near the ground that then helps transport cooler air from surrounding rural areas. The rural areas then go on to absorb the heat."

The study's analysis concluded with specific recommendations on how to "use less dense, less expensive rural land to increase cities’ cooling capacities," Blakemore reports. "Planting woodland around cities and consolidating bodies of water in rural areas are potential ways to cool cities. . . . By better regulating rural land, the researchers suggest, it could be possible to both maintain rural landscapes and boost rural economies while making urban areas cooler and more sustainable."