CORBIS, MICHAEL POLE
Human beings have inexorably altered the world’s ecosystems. We’ve plowed and seeded more than 40 percent of the Earth’s land surfaces, introduced alien species into new territories, poured carbon dioxide into the atmosphere, disrupted natural climate cycles, and polluted aquatic ecosystems with excessive nitrogen and other contaminants.
These far-reaching changes have spurred scores of researchers to examine the impacts of human activities on biodiversity and ecosystem functioning, and to devise management strategies that might lessen the damage. Scientists have scoured ecosystems from the ocean’s depths to the highest mountain peaks searching for signals of global change. But only recently has this attention extended under the Earth’s surface to the soil, and the linkages between plants and belowground microbial and animal communities. This realm of research ...
