May 2019 was a turning point for climate change. The world reached a record of 415.3 parts per million of carbon dioxide (ppm CO2) in the atmosphere—the most in over 3 million years. The UK Parliament declared an environmental and climate emergency on May 1. Pope Francis followed this by declaring a climate emergency on June 14.
A study published in May shows that if we don’t succeed in radically reducing emissions, civilization could collapse by 2050. The authors of the report showed that we are on track to "… a world of 'outright chaos' on a path to the end of human civilization and modern society as we have known it…"
The good news is that we can turn this around by scaling up regenerative agriculture.
Why Regenerative Agriculture?
Regenerative agriculture is based on a range of food and farming systems that use the photosynthesis of plants to capture CO2 and store it in the soil. The soil holds more than double the amount of carbon than the atmosphere and biomass (forests and plants) combined.
Why is it so important to dramatically reduce the current rate of CO2 emissions?
If emissions are not reduced soon, we will be going into catastrophic climate change, that we may not be able to reverse. This is because it will take centuries to get the heat out of our oceans. Ocean heat is a significant driver of our weather. The oceans and the atmosphere are already around 1.8 degrees Fahrenheit (1 degree Celsius) warmer than during the industrial revolution.
The energy needed to heat the atmosphere and the ocean by 1.8 degrees is equivalent to billions of atomic bombs. I am using this violent metaphor so that people can understand how much energy is being released into our atmosphere and oceans and why we will get more extreme weather events wreaking havoc on our communities and environment.This extra energy is already violently fueling and disrupting our weather systems. It causing weather events to be far more intense. Winter storms are becoming colder and can be pushed further south and north than normal due to this energy, bringing damaging snowstorms and intense floods. Similarly, summer storms, especially hurricanes, tornadoes, tropical lows etc. are far more frequent and intense with deluging destructive rainfall and floods. Droughts and heat waves are more common and are resulting in more crop failures. They are also fueling damaging forest and grass fires that are burning out whole communities and changing regional ecologies due to not allowing time for recovery before the next fires.
The frequency and intensity of these types of events will only get exponentially worse when the world warms to 3.6 degrees Fahrenheit (2 degrees Celsius) which is the upper limit of the Paris climate agreement. And we are on track to shoot past this goal.
Managing climate change is a major issue that we have to deal with now
Atmospheric CO2 levels have been increasing at 2 parts per million (ppm) per year. The level of CO2 reached a new record of 400 ppm in May 2016. However, despite all the commitments countries made in Paris in December 2015, the levels of CO2 increased by 3.3 ppm in 2016 creating a record. It increased by 3.3 ppm from 2018 to set a new record of 415.3 ppm in May 2019. This is a massive 60 percent increase in emissions per year since Paris and shows the reality is that most countries are not even close to meeting their Paris reduction commitments and many must be cheating on or ignoring their obligations.
According to the World Meteorological Organization, "Geological records show that the current levels of CO2 correspond to an 'equilibrium' climate last observed in the mid-Pliocene (3–5 million years ago), a climate that was 2–3 °C (3.6 - 5.4 F) warmer, where the Greenland and West Antarctic ice sheets melted and even some of the East Antarctic ice was lost, leading to sea levels that were 10–20 m (30 to 60ft) higher than those today."
Global sea levels rises will cause the atoll island countries, large parts of Bangladesh, Netherlands, coastal USA, New York, New Orleans, Miami, London, Manila, Bangkok, Jakarta, Shanghai, Singapore, Melbourne, Brisbane, Sydney, Dar es Salam and other low lying areas to go under water.
Even if the world transitioned to 100 percent renewable energy tomorrow, this will not stop the temperature and sea level rises because it will take more than 100 years for the CO2 levels to drop. According to latest report, sea level rises, droughts and floods will cause a huge refugee crisis for over a billion people by 2050 and throw our civilization into chaos. The world cannot cope with 2 million refugees from Syria. How do we cope hundreds of millions of climate change refugees? There will be wars over food, water, land.
The fact is we have to speed up the transition to renewable energy and we have to make a great effort to drawdown CO2 in the atmosphere.
Reversing climate change
Four hundred and fifteen ppm is way past the Paris objective of limiting the temperature increase to 3.6 degrees Fahrenheit (2 degrees Celsius). The levels need to be well below 350 ppm. The excess CO2 must be drawn down from the atmosphere to stop damaging climate change.
In order to stabilize atmospheric CO2 levels, regenerative agricultural systems would have to drawdown the current emissions of 3.3 ppm of CO2 per year. Using the accepted formula that 1 ppm CO2 = 7.76 Gt CO2 means that 25.61 gigatons (Gt) of CO2 per year needs to be drawn down from the atmosphere.
Potential of best practice regenerative agriculture
BEAM (Biologically Enhanced Agricultural Management), developed by Dr. David Johnson of New Mexico State University, produces compost with a high diversity of soil microorganisms. Multiple crops grown with BEAM have achieved very high levels of sequestration. Peer-reviewed research published by Dr. Johnson and colleagues show. “… 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.
These figures mean that BEAM can sequester 37,700 kilos of CO2 per hectare per year which is approximately 37,000 pounds of CO2 per acre.
BEAM can be used in all soil based food production systems including annual crops, permanent crops and grazing systems. If BEAM was extrapolated globally across agricultural lands it would sequester 185 Gt of CO2 per year.
Potential of regenerative grazing
The Savory Institute and many others have been scaling up holistic managed grazing 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.
Around 70 percent of the world’s agricultural lands are used for grazing. The published evidence shows that correctly managed pastures can build up soil carbon faster than many other agricultural systems and this is stored deeper in the soil.
Research by published 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% and 34%, respectively.”
The means that they have sequestered 29,360 kilos of CO2 per hectare per year. This is approximately 29,000 pounds of CO2 per acre. If these regenerative grazing practices were implemented on the world’s grazing lands they would sequester 98.6 Gt of CO2 per year.
Ending the climate emergency
Transitioning a small proportion of global agricultural production to these two peer-reviewed, evidence based, best practice, regenerative systems will sequester enough CO2 to reverse climate change and restore the global climate.
Ten percent of agricultural lands under BEAM could sequester 18.5 Gt of CO2 per year.
And a further 10 percent of grasslands under regenerative grazing could sequester 10 Gt of CO2 per year.
This would result in 28.5 Gt of CO2 per year being sequestered into the soil which is more than the amount of sequestration needed to drawdown the 25.61 Gt of CO2 that is currently being emitted.
These back-of-the envelope calculations are designed to show the considerable potential of scaling up proven high-performing regenerative systems. The examples are "shovel ready" solutions as they are based on existing practices. There is no need to invest in expensive, potentially dangerous and unproven technologies such as carbon capture and storage or geo-engineering.
We are in a climate change emergency and we need every tool in the tool box to fix this problem. We don’t have the luxury of wasting precious time on intellectual arguments about whether this is possible or to convince skeptics and land managers unwilling to change.
It is time to get on with drawing down the excess CO2 by scaling up existing regenerative agriculture practices. This is very doable and achievable. It would require minimal financial costs to fund existing institutions, training organizations and relevant NGOs to run courses and workshops.
The widespread adoption of best practice regenerative agriculture systems should be the highest priority for farmers, ranchers, governments, international organizations, elected representatives, industry, training organizations, educational institutions and climate change organizations. We owe this to future generations and to all the rich biodiversity on our precious living planet.
Johnson D, Ellington J and Eaton W, (2015) Development of soil microbial communities for promoting sustainability in agriculture and a global carbon fix, PeerJ PrePrints | http://dx.doi.org/10.7287/peerj.preprints.789v1 | CC-BY 4.0 Open Access | rec: 13 Jan 2015, publ: 13 Jan 2015
Lal R (2008). Sequestration of atmospheric CO2 in global carbon pools. Energy and Environmental Science, 1: 86–100.
McCosker, T. 2000. “Cell Grazing – The First 10 Years in Australia,” Tropical Grasslands. 34: 207-218.
Machmuller MB, Kramer MG, Cyle TK, Hill N, Hancock D & Thompson A (2014). Emerging land use practices rapidly increase soil organic matter, Nature Communications 6, Article number: 6995 doi:10.1038/ncomms7995, Received 21 June 2014 Accepted 20 March 2015 Published 30 April 2015
NOAS (2017). National Oceanic and Atmospheric Administration (US)
https://www.climate.gov/news-features/climate-qa/how-much-will-earth-warm-if-carbon-dioxide-doubles-pre-industrial-levels, Accessed Jan 30 2017
Spratt D and Dunlop I, 2019, Existential climate-related security risk: A scenario approach,
Breakthrough - National Centre for Climate Restoration, Melbourne, Australia
www.breakthroughonline.org.au, May 2019 Updated 11 June 2019
Tong W, Teague W R, Park C S and Bevers S, 2015, GHG Mitigation Potential of Different Grazing Strategies in the United States Southern Great Plains, Sustainability 2015, 7, 13500-13521; doi:10.3390/su71013500, ISSN 2071-1050, www.mdpi.com/journal/sustainability
United Nation’s Food and Agriculture Organization (FAO), FAOSTAT data on land use, retrieved December 4, 2015
The total amount of land used to produce food is 4,911,622,700 Hectares (18,963,881 square miles).
This is divided into:
Arable/Crop land: 1,396,374,300 Hectares (5,391,431 square miles)
Permanent pastures: 3,358,567,600 Hectares (12,967,502 square miles)
Permanent crops: 153,733,800 square kilometers (593,570 square miles)
A basic calculation shows the potential of scaling up this simple technology across the global agricultural lands. Soil Organic Carbon x 3.67 = CO2 which means that 10.27 metric tons soil carbon = 37.7 metric tons of CO2 per hectare per year (t CO2/ha/yr). This means BEAM can sequester 37.7 tons of CO2 per hectare which is approximately 38,000 pounds of CO2 per acre.
If BEAM was extrapolated globally across agricultural lands it would sequester 185 Gt of CO2/yr.
(37.7 t CO2/ha/yr X 4,911,622,700 ha = 185,168,175,790t CO2/ha/yr)
Regenerative grazing calculations
To explain the significance of Machmuller’s 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, which means that these grazing systems have sequestered 29,360 kgs (29.36 metric tons) of CO2/ha/yr. This is approximately 30,000 pounds of CO2 per acre.
If these regenerative grazing practices were implemented on the world’s grazing lands they would sequester 98.6 Gt CO2/yr.
(29.36t CO2/ha/yr X 3,358,567,600 ha = 98,607,544,736t CO2/ha/yr)