Steadily and alarmingly, humans have been depleting Earth’s soil resources faster than the nutrients can be replenished. If this trajectory does not change, soil erosion, combined with the effects of climate change, will present a huge risk to global food security over the next century, warns a review paper authored by some of the top soil scientists in the country.
The paper singles out farming, which accelerates erosion and nutrient removal, as the primary game changer in soil health.
“Ever since humans developed agriculture, we’ve been transforming the planet and throwing the soil’s nutrient cycle out of balance,” said the paper’s lead author, Ronald Amundson, a professor of environmental science, policy and management at the University of California, Berkeley. “Because the changes happen slowly, often taking two to three generations to be noticed, people are not cognizant of the geological transformation taking place.”
http://www.eurekalert.org/pub_releases/2015-05/uoc–hsa050515.php