Key Microbes Help Form Topsoil Crusts in Arid Lands (image) Arizona State University Share Print E-Mail Caption Temperature determines where key soil microbes can thrive -- microbes that are critical to forming topsoil crusts in arid lands. Arizona State University scientists predict that in as little as 50 years, global warming may push some of these microbes out of their present stronghold in colder US deserts, with unknown consequences to soil fertility and erosion. Credit Estelle Couradeau Usage Restrictions Only with photo credit Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.