Cows and Sand

Cows and Sand: Effects of Livestock Overgrazing  

by Moses Seenarine 12/15/17

Worldwide, livestock overgrazing practices are substantially reducing many grasslands' performance as carbon sinks. Overgrazing occurs on 33% of all range-land, and often, marginal range-lands are used intensively when historically productive adjacent range has become overgrazed and unproductive. The cycle of overgrazing, soil degradation, topsoil erosion and loss of vegetation is rapidly expanding on all continents. 

The chief ecological impacts of overgrazing are (i) the loss of biodiversity, (ii) irreversible loss of topsoil, (iii) strengthening of turbidity in surface waters, and (iv) greater flooding frequency and intensity. Overgrazing of pastureland leads to a decrease in long-term grazing productivity. In Botswana, for example, farmers' common practice of overstocking cattle to cope with drought losses made ecosystems further vulnerable and risked long-term damage to herds by depleting scarce biomass. 

Globally, 70% of all grazing land in dry areas is considered degraded, mostly because of overgrazing, compaction and erosion attributable to livestock activity. Worldwide, overgrazing can be considered the major cause of desertification in arid dry-lands, tropical grasslands, and savannas. On top of that, in arid and semi-arid dry-lands around the globe, overgrazing is the major cause of desertification. 

Placement of high densities of livestock on a grassland removes biomass at a rapid rate, which produces a series of accompanying effects. For instance, (i) the residual plants decline in mass density, and (ii) surface water infiltration is reduced. Then (iii) there is a dwindling away of fungal biomass that relies on grasses. Ground surface temperatures rise, which exaggerates the amount of (iv) evaporation and (v) transpiration, and this leads to (vi) a build up in aridity. In addition, overgrazing has a characteristic effect of (vii) reducing root depths. With impeded water uptake from the soil, a positive feedback loop of growth retardation is established. 

At least 25% of the world's biodiversity lives underground where the earthworm is a giant alongside tiny organisms such as bacteria and fungi. These organisms act as the primary agents driving nutrient cycling, and they help plants by improving nutrient intake, which in turn supports above-ground biodiversity. 

Removing livestock, and better soil and land management that supports healthy soil organisms can boost the soil's ability to absorb carbon and mitigate desertification. This could result in greater quantities of carbon being sequestered, thus helping to offset agriculture's own emissions of GHGs. A four-year survey of the northern China plains concluded that by reducing grazing pressure to half can deliver improved ecosystem services like lower GHGs and improved grassland composition. Early summer rest maintained the best grassland composition. 

In the US, removing livestock from public lands would reduce CH4 discharges, with attendant benefits for climate mitigation. This climate action would also mirror federal nutrition policy, particularly the recommendation to eat less cow flesh. Much of the degraded environmental conditions on public lands and waters caused by grazing farm animals would end. This would enable improvement or even recovery of vulnerable areas. And, undertaking this policy shift makes fiscal sense by saving taxpayer dollars.

Excerpt from "Meat Climate Change: The 2nd Leading Cause of Global Warming," by Dr. Moses Seenarine.

Unsavory Soil Management

Unsavory Soil Management: 

Why High-Density Grazing is an Unmitigated Climate and Social Disaster 

by Moses Seenarine 11/20/17

Many supporters of animal farming question the significance of land degradation and GHG pollution from livestock grazing. They often cite Allan Savory's claim that livestock's damaging effects on soil and the climate can be controlled through “holistic management and planned grazing.” Savory's process purportedly allows domesticated herds to act as “a proxy for former herds and predators”, in trampling dry grass and leaving “dung, urine and litter or mulch.” This supposedly enables the soil to “absorb and hold rain, to store carbon, and to break down methane.” 

Contrary to the scientific literature, Savory's popular theory to reverse desertification and return the atmosphere to preindustrial levels requires a massive enlargement in livestock production. Be that as it may, agricultural and environmental science suggests Savory's claim is simply not reasonable. For instance, the massive, ongoing additions of carbon into the atmosphere from human activity far exceed the carbon storage capacity of global grasslands. 

Savory’s ultra-high stock density (UHSD) methods have garnered little support from agricultural science, and there are many researchers critical of his unscientific methods. One accuses him of piecing together false assumptions to produce ineffective but popular recommendations on climate mitigation. 

Another scholar point to Savory’s numerous inconsistencies and varying methods. A review of experiments from 13 North American sites and additional data from Africa reveal there is little evidence for any of the environmental benefits which Savory claimed for his methods. Other researchers point out that intensive (cell) grazing is only viable where water points are close and labor is cheap. Temporary or permanent fencing is labor intensive, and moving herds daily requires more labor that most livestock operations cannot afford. 

Nonetheless, the livestock industry and popular trade magazines are touting the miracle of ultra-high stock density (UHSD) grazing for small-scale farmers. Farming at amounts exceeding 1 million pounds (463,600 kg) of live animal per acre is far beyond the capacity of the family farm. At this high level of stock density, cattle have to be moved multiple times per hour, per grazing period. There is no known "magical" stock density value that expedites the desired outcomes, but the greater the stock density the bigger the herd impact. Farmers need to have capable pen and corral space, sufficient drinking water and recharge capabilities, effective fencing with quality energizer to carry electricity to extremities of the property, plenty of temporary electric fence supplies, and suitable equipment to quickly deploy them. 

Due to herd impact, recovery periods are usually longer thus lengthening grazing cycles, especially in areas impacted during wet periods. Intrinsically, UHSD requires massive amounts of land and labor, and cannot be accomplished sustainability or by family farms. Emma Archer's review of 14 years of satellite imaging data in South Africa ascertained that Savory's intensive grazing practices caused lower levels of vegetation than traditional approaches, when rainfall is added. 

Rather than the desertification outcome of UHSD, there is massive potential for reforestation in Africa if livestock is removed and the related savanna burning is stopped. Even though Savory's methods have been repeatedly debunked for many decades, it is popularly promoted by the food animal industry, environmentalists and many others, to justify environmentally destructive carnivory. In reality, UHSD causes severe land degradation which may have been a major factor in wars in Darfur and Syria. Far from being a solution, enlarging livestock production is an unmitigated climate and social disaster.

Excerpt from "Meat Climate Change: The 2nd Leading Cause of Global Warming," by Dr. Moses Seenarine.

Yes but No! Doesn't Global Warming Help Plants?

Yes, but No! Doesn't Global Warming Help Plants?

by Moses Seenarine, 11/17/17

Global Warming deniers claim that natural negative feedback absorbs excess CO2. While this is true, this weathering process takes hundreds of thousands of years. In the ancient past, excess CO2 came mostly from volcanoes that released very little compared to what humans do now. The excess GHG was removed from the atmosphere through the weathering of mountains, which takes in CO2. 

Modern humans are releasing CO2 into the atmosphere 14,000 times faster than nature has over the past 600,000 years, far too quickly for natural negative feedbacks to respond. The system is now entirely out of equilibrium and it will take a long time to become balanced again. Oddly, despite evidence to the contrary, deniers argue that negative feedbacks dominate the climate. But the spiral in natural disasters and spread of extreme weather events suggests just the opposite, that amplifying positive feedbacks are dominating.

'Skeptics' maintain that warming is not necessarily bad and a small amount of warming is a good thing. On the contrary, one-degree warming is already causing a lot of problems, as the IPCC AR5 report on climate impacts documents. To boot, business-as-usual GHG outflows could bring forth a 3°C to 5°C (5.4 - 9°F) rise fairly quickly. 

Another common contrarian argument is that CO2 is not bad since it is necessary for life on Earth, and accounts for only 4 parts in 10,000 of the atmosphere. Carbon dioxide is not a dangerous gas, but it is a pollutant since too much causes climate shifts. The whole lifecycle of the gas has to be taken into account, not just the limited function it serves for plants. And it causes ocean acidification, which is another huge problem. 

Deniers assert that climate theory is contradictory and cannot be supported by both floods and droughts, or too much snow and too little snow. But these events are part of the natural process of climate adjustment. Moreover, these variations can be explained by climate science. 

Higher temperatures augment evaporation, exacerbating droughts and adding larger amounts of moisture to the air for stronger storms. And, the warming is happening to a greater extent at higher latitudes. This phenomenon reduces the temperature difference between higher and lower latitudes, which slows down storms and dumps extra precipitation in localized areas. Correspondingly, it causes greater snow and flooding in these areas, and less snow and drought outside of them. 

Excerpt from "Meat Climate Change: The 2nd Leading Cause of Global Warming," by Dr. Moses Seenarine.