A picture of smiling face made of rice plants is seen at a paddy field in Xianju county, Zhejiang province, August 27, 2015. Photo: courtesy REUTERS

ROME: Feeding a growing global population will become almost impossible if the world doesn't take better care of its rapidly deteriorating soils, a humanitarian agency warned on Earth Day.

More than a third of arable land is already degraded because of soil erosion - the loss of the topsoil by wind, rain or use of machinery - as well as contamination of soil and city sprawl, according to Catholic Relief Services (CRS).

"If we don't start to address the issue of soil erosion I don't see how we can address the food security needs," Lori Pearson, an agricultural adviser at CRS told the Thomson Reuters Foundation.

Here are some facts on soils degradation and farming:

* Roughly 95 percent of all food in the world is produced in soil.

* More than 35 percent of ice-free land has been cleared of vegetation and converted to agriculture leaving soils more exposed to erosion and losses in soil carbon and nutrients.

* Earth's soils contain more carbon than the planet's atmosphere and vegetation combined.

* When land is overexploited or degraded, trapped carbon is released back into the atmosphere, resulting in planet warming emissions.

* It takes nature between 100 and 1,000 years to produce 1 cm of soil, and if poorly maintained it can be lost in a single rainfall, or high wind.

* The world is currently losing soil 10 to 20 times faster than it is replenishing it.

* Each year 25 to 40 billion tonnes of topsoil are carried away by erosion.

* Crop losses to erosion could reach 10 percent by 2050 - equivalent to removing roughly all the arable land in India from crop production - if no action is taken.

* With the global population set to reach more than 9 billion by 2050, food production must rise by about 60 percent to generate enough for everyone to eat.

*Planting more lentils, chickpeas and other pulses can improve the health of the world's soils. Sources: U.N. Food and Agriculture Organization (FAO), Barilla Center for Food and Nutrition Foundation