CAM 13 - TEST 4 - READING 2
SAVING THE SOIL More than a third of the Earth’s top layer is at risk. Is there hope for our planet’s most precious resource? A More than a third of the world’s soil is endangered, according to a recent UN report. If we don’t slow the decline, all farmable soil could be gone in 60 years. Since soil grows 95% of our food, and sustains human life in other more surprising ways, that is a huge problem. B Peter Groffman, from the Cary Institute of Ecosystem Studies in New York, points out that soil scientists have been warning about the degradation of the world’s soil for decades. At the same time, our understanding of its importance to humans has grown. A single gram of healthy soil might contain 100 million bacteria, as well as other microorganisms such as viruses and fungi, living amid decomposing plants and various minerals. That means soils do not just grow our food, but are the source of nearly all our existing antibiotics, and could be our best hope in the fight against antibio...