New York Times: THE worlds worrisome decline in biodiversity is well known. Some experts say we are well on our way toward the sixth great extinction and that by 2100 half of all the worlds plant and animal species may disappear. Yet one of the most important threats to biodiversity has received little attention though it lies under our feet. Scientists using new analytical techniques over the last decade have found that the worlds ocean of soil is one of our largest reservoirs of biodiversity. It contains...