Editor's Note: Zhang will lead a panel of experts at the AGU annual meeting to discuss global permafrost and climate warming issues Dec. 13 at 9 a.m., room 2012, Moscone Convention Center West, San Francisco, Calif. Engineers constructing a new railroad across the vast, high-altitude Tibetan Plateau are using a surprisingly simple idea to fortify shifting frozen soils affected by climate warming, according to a University of Colorado at Boulder permafrost expert.