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The world needs topsoil to grow 95% of its food – but it's rapidly disappearing
by applewood

    The sense of urgency over topsoil is growing as the planet is projected to reach 9 billion people by 2050. Without a healthy farm system, farmers won’t be able to feed the world’s growing population, says Dave Montgomery, a geologist at the University of Washington and author of the book Growing a Revolution: Bringing Our Soil Back to Life.

    To see what can happen to civilizations that lost the topsoil they needed to grow food, look no further than Syria or Libya. Roman tax records show that those areas grew ample amounts of wheat, but as farmers continued to plow their fields, they exposed valuable microbes and topsoil eroded. Today those areas barely have any soil to grow crops.

    “Societies that lose their topsoil, their descendants pay the price,” Montgomery says. “Nature takes a long time to build soil.” By some estimates, it can take 500 years for healthy topsoil to develop and less than a century to degrade.