Interesting article about the rapidly growing regenerative agriculture movement. An increasing body of research indicates that proper pasture management sequesters carbon (in soil) far more rapidly than either tree planting, transitioning to plant-based diets and crops or carbon sequestration technology. Regenerative grazing, in which grass is grazed to within a foot of the ground but not completely down to the ground, is one of the simplest and most effective regenerative agriculture techniques. It’s not meat that’s destroying our planet, but the way meat is produced under industrial agriculture. Someone needs to tell the UN (and the corporate media).
This year’s Acres U.S.A. Conference features numerous speakers, who can show how we can reverse the disruptive effects climate change by adopting best practice regenerative production systems. These systems will also make our farms and ranches more productive and resilient to the current erratic climate disruption that we are all facing.
The Solution Is Under Our Feet!
In order to stop the present increase in atmospheric CO2, agricultural systems would have to sequester 2.3 ppm of CO2 per year. Using the accepted formula that 1 ppm CO2 = 7.76 Gt CO2 means that 17.85 Gt of CO2 per year needs to be sequestered from the atmosphere and stored in the soil as soil organic carbon (SOC).
Stopping the increase in (green house gasses) GHGs and then reducing them must be the first priority, and this should be non-negotiable. Moving to renewable energy and energy efficiency will not be enough to stop the planet from warming over the next hundred years and going into damaging climate change. The amount of 405 ppm is past the level needed to meet the Paris objective of limiting the temperature increase to +1.5/2°C (2.7/3.6° F). The levels need to be well below 350 ppm. The excess CO2 must be sequestered from the atmosphere to stop damaging climate change.
Soils are the greatest carbon sink after the oceans. There is a wide variability in the estimates of the amount of carbon stored in the soils globally. According to Professor Rattan Lal, there are over 2,700 gigatons (Gt) of carbon stored in soils. The soil holds more carbon than the atmosphere (848 Gt) and biomass (575 Gt) combined. There is already an excess of carbon in the oceans that is starting cause a range of problems. We cannot put any more CO2 in the atmosphere or the oceans. Soils are the logical sink for carbon.
Most agricultural systems lose soil carbon with estimates that agricultural soils have lost 50-70 percent of their original SOC pool, and the depletion is exacerbated by further soil degradation and desertification. Agricultural systems that recycle organic matter and use crop rotations can increase the levels of SOC. This is achieved through techniques such as longer rotations, ground covers, cover crops, green manures, legumes, compost, organic mulches, biochar, perennials, agro-forestry, agroecological biodiversity and livestock on pasture using sustainable grazing systems such as holistic grazing. These systems are starting to come under the heading of “regenerative agriculture” because they regenerate SOC.
Regenerative Agriculture Potential
BEAM (Biologically Enhanced Agricultural Management), is a process developed by Dr. David Johnson of New Mexico State University, that uses compost with a high diversity of soil microorganisms. BEAM has achieved very high levels of sequestration. According to Johnson et al., “… a 4.5 year agricultural field study promoted annual average capture and storage of 10.27 metric tons soil C ha-1 year -1 while increasing soil macro-, meso- and micro-nutrient availability offering a robust, cost-effective carbon sequestration mechanism within a more productive and long-term sustainable agriculture management approach.” These results have since been replicated in other trials.
Soil Organic Carbon x 3.67 = CO2 which means that 10.27 metric tons soil C ha-1 year -1 = 37.7 metric tons of CO2 per hectare per year. (38,000 pounds of CO2 per acre per year – close enough)
If BEAM was extrapolated globally across agricultural lands it would sequester 184 Gt of CO2/yr.
The Savory Institute, Gabe Brown and many others have been scaling up holistic management systems on every arable continent. There is now a considerable body of published science and evidence-based practices showing that these systems regenerate degraded lands, improve productivity, water holding capacity and soil carbon levels.
Nearly 70 percent of the world’s agricultural lands are used for grazing. The published evidence is showing that correctly managed pastures can build up SOC faster than many other agricultural systems and that it is stored deeper in the soil.
Research by Machmuller et al. 2015: “In a region of extensive soil degradation in the southeastern United States, we evaluated soil C accumulation for 3 years across a 7-year chronosequence of three farms converted to management-intensive grazing. Here we show that these farms accumulated C at 8.0 Mg ha−1 yr−1, increasing cation exchange and water holding capacity by 95 percent and 34 percent, respectively.”
To explain the significance of these figures: 8.0 Mg ha−1 yr−1 = 8,000 kgs of carbon being stored in the soil per hectare per year. Soil Organic Carbon x 3.67 = CO2, means that these grazing systems have sequestered 29,360 kgs (29.36 metric tons) of CO2/ ha/yr.
If these regenerative grazing practices were implemented on the world’s grazing lands they would sequester 98.5 gt CO2 per year.
Just transitioning 10-20 percent of agricultural production to best practice regenerative systems will sequester enough CO2 to reverse climate change and restore the global climate. Regenerative agriculture can change agriculture from being a major contributor to climate change to becoming a major solution. The widespread adoption of these systems should be made the highest priority by farmers, ranchers, governments, international organizations, industry and climate change organizations.
André Leu is international director of Regeneration International. He is a longtime farmer in Australia and past president of the International Federation of Organic Agricultural Movements. He is the author of The Myths of Safe Pesticides and Poisoning Our Children, published by Acres U.S.A.
Other good links about regenerative grazing:
Mother Earth News
New Zealand Herald