Climate change

November 6, 2009

Red Necked Aussie Greenies

Filed under: Climate Change, Emissions Reduction, Livestock's long shadow — Barry Brook @ 10:56 pm

Guest Post by Geoff Russell. Geoff is a mathematician and computer programmer and is a member of Animal Liberation SA. His recently published book is CSIRO Perfidy.

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redneck

UK Economist Lord Nicholas Stern is the latest in a growing list, including IPCC head Rajendra Pachauri and NASA climate scientist James Hansen calling for a global shift in dietary habits towards less meat. The CSIRO has issued a new Home Energy Saving Handbook which tells people diplomatically, but unambiguously, that if they do use the CSIRO Total Wellbeing Diet, with its huge meat component, then use it for as brief a period as possible and switch to a high carbohydrate diet which has a much lower greenhouse footprint. The book also has a great section on the implications of suburban food growing, including a mention that this also tends to reduce meat consumption. This new CSIRO handbook is a long way short of the major public corporate apology that I called for in my recent book CSIRO Perfidy, but it’s an excellent start. All in all this CSIRO book is a great practical book about how people can significantly reduce their various footprints on the planet. It doesn’t fall into any of the all too common traps like considering the fuel consumption of a car, but ignoring the emissions generated during the building of the vehicle.

Stern’s call reduced animal product intake follows close on the release of a report on livestock and climate change from the Food Ethics Council in the UK(commisioned by World Wildlife Fund (WWF)). The press release announcing the report contains a statment which will probably raise the blood pressure of any meat producer. It says that the report:

Identifies a wide array of measures by which government might change consumption behaviour, …

The livestock industry can live with feel good statments about breeding for lower emitting cattle and the like, but changes to consumption, changes that would actually make a difference, that is anathema.

At the risk of boring people who know this stuff, let me quantify using an analogy that I hope will clarify. Consider a computer screen. I’m using a 19 inch 37 watt LCD. My TV is a little bigger and uses 58 watts. Most people know that huge plasma TVs can be more than a little bigger and use 10 times more power. Systems labelled home theatre can run to over 1500 watts … about half for the sound and half for the picture. Now, pause and think what would happen if somebody started making 7400 watt screens that were much the same size as normal screens. Imagine further that these screens caused serious and frequently life shortening health problems.

Would anybody defend such screens? Would anybody bother with a defence that better manufacturing could reduce their power usage by 25%?

The 7400:37 ratio is about the same as the ratio of greenhouse emissions between lean beef and pasta. The ratio is even higher if the short term (20 year) warming impact of methane is considered. A study hot off the press in Science into the indirect effects of methane calculates that adding these flow-on impacts lifts the warming due to methane by as much as 50%. This makes lean beef akin to a 10,000 watt screen.

Tim Flannery, in the longest chapter of his recent Now or Never essay (Quarterly Essay 31) has put forward a plan to massively increase global beef production … the direct equivalent of a plea to stock the planet with an abundance of 7400 watt computer screens. This has been criticised by both myself (see Quarterly Essay 32) and Peter Singer. Responding to Singer in the US edition of Now or Never, Flannery writes:

And in the beef sector, it’s been found that smaller breeds of cattle produce 25 percent less methane than standard breeds, and that the overall management of the herd has an enormous impact on the overall greenhouse gas balance of the business.

If he were consistent, Flannery should similarly allow that a 25% reduction in the power required for a 7400 watt screen should earn it a green energy saver badge.

In Perfidy, which is about far more than just the CSIRO’s dodgy diet, I examine the implications of Flannery’s call for more cattle in some detail. Firstly, it’s an impossible vision. But going with Flannery’s flight of fancy and assuming there is enough land to graze enough cattle so that most of the planet (leaving out a billion or so steadfastly vegetarian Indians) ate the same amount of beef as Australians (bearing in mind that more chicken is eaten than beef in Australia these days), we would add about another 98 mega tonnes to the annual global emissions of methane. If you are unfamiliar with the global methane budget, the current anthropogenic emissions are about 350 mega tonnes, so a 98 mega tonne injection of methane would be huge.

So, on the one side we have a growing international call to scale down the livestock sector, particularly cattle, but in Australia we either don’t report such calls (and you won’t find the Food Ethics Council paper on the Australian WWF website), or they get a brief mention on page 23 and we have high profile environmentalists like Flannery pushing in the opposite direction. One of the reasons I’ve always been on the fringe of environment groups and more comfortable in animal rights groups is that many greens (and Greens), like Flannery, seem to place the sanctity of the BBQ above the health of the planet. I have absolutely no idea what drives such people, they steadfastly refuse to follow where the evidence leads. Anybody who reads Peter Singer’s work will realise that for him and others in the animal rights camp, using information and logic to formulate ways to minimise suffering isn’t mere entertainment, but the final arbiter of action.

Which leads me to Kelly’s Bush.

Kelly’s bush is about 7 acres of bush land on Sydney’s wealthy North Shore. In the early 1970s it was threatened with development. Some regard the fight to save Kelly’s Bush as the birth of the modern Australian green activist movement. The fight was spear headed by the famous Green Bans imposed by the Builder’s Labourers Union, led by Jack Mundey. The bans began in the early 1970s, but the story I want to tell goes back a decade earlier to 1962. What happened in 1962? Yes, I know, Rachel Carson published Silent Spring, but that’s just a book, what actually happened? What actually happened was that Bob Kleberg of King Ranch in Texas bought 50,000 acres of primary rainforest along the Tulley River in north Queensland (ironically not far from where Jack Mundey grew up) and worked out how to use 50 tonne bulldozers to fell giant rainforest trees for just $20 a cleared acre. A huge rolling steel ball with spikes is dragged between the dozers on a chain and when it hits a tree it climbs. As it mounts the tree, the dozers gain leverage and can knock down anything. By 1965, the 50,000 acres (about 20,000 hectares) was gone. By the early 1970s, I’ll wager some of that Tully beef ended up in BBQs and sandwiches at Green Ban picket lines in Sydney. Meanwhile the bulldozers where shipped to Venezuela and the now perfected methods were used there and later in Brazil in an attack on the planet’s rainforests that is on-going.

Such is the story of high profile environmentalism in Australia. The real fight to preserve biodiversity should have been fought in our supermarkets, but the big green organisations, the ones with a profile high enough to have a chance at effecting major consumer change, are too busy having BBQ fundraisers and fighting for can deposits and against plastic bags. But the deliberate focus on the trivial by many in the green movement is more generally symptomatic of what passes for ethical debate in Australia. This is particularly obvious when we consider the ethics of climate change.

Back in May, The Lancet published the results of a joint study with the University College London on the health impacts of climate change.

The study contains the following map (from a 2007 study) showing the causal responsibility of climate change compared with the likely adverse health impacts. The former were measured in giga-tonnes of carbon emitted between 1950 and 2000 while the latter were measured in mortality per million of population. The geographical area of each country in the map has been transformed so that relative areas correspond to relative causes or health impacts. The malnutrition component comes from an earlier World Health Organisation modelling study and is due to a projected increase in regional droughts.

Note that this is a per-capita measure of suffering, not an absolute measure. A map showing relative absolute suffering would make the ethical responsibility even more obvious but would possibly see some of countries which are major causes of climate change totally disappear in the map of adverse impacts.

getpage-costello11

The malnutrition impacts are considered to have already started. It is of course difficult to disentangle malnutrition due to climate change from malnutrition due to other causes but a June FAO press release shows we have climbed to over a billion undernourished people, having been hovering at about 800 million between 1990 and 2003 when the wheels started to fall off the global food machine. The UN Food and Agriculture Organisation is now reporting in its 2009 State of Food Insecurity report (SOFI) that the absolute number of malnourished people has been rising since the mid 1990s.

The Lancet isn’t on my list of regularly read journals, but I thought it a little wierd that I’d never heard of this report. So I did some googling to see who covered it at the time. Who did I find? The only sizable news sources which reported on the report were: Radio AustraliaThe ABC (online) and The Mercury. Unsurprisingly, I found no mentions in any of the major newspapers.

Taken at face value, the maps make the asymmetry of causes and impacts abundantly clear. We in the developed world are responsible for most of the pain and suffering that will be felt predominantly (but not exclusively) in the developing world.

Humans have an extraordinarily well developed sense of fairness and justice. But it isn’t just humans who have this. A sense of fairness extends, at least, to other primates. Capuchin monkeys will refuse to work for rewards where they can see other monkeys getting more rewards for the same work. Sound familiar?

The maps plus the monkey research make it entirely unsurprising that both the Chinese and the Indians are playing hard ball in the run up to the Copenhagen climate negotiations.

Wondering why the report and the maps weren’t more widely reported in Australia, I formulated a quick hypothesis: Australians don’t care much for ethical issues. But then I thought more deeply and considered NSW’s MP John Della Bosca’s recent resignation and the blanket media coverage it received. So I modified my hypothesis. Australians treat ethics as a spectator sport, rather like football. Its great to watch a bit of biffo as long as you’re not on the receiving end of the real thing. This is supported by a few tables in How Australia Compares, a nice book of selected OECD data tables selected by Rodney Tiffen and Ross Gittins. In particular Australia is down at, or near, the bottom of the OECD countries in the income of its disabled people, the rate of children living in poverty in either single mother or two parent households, the level of unemployment benefits, and a host of other measures. This book came out in 2004 and most of the tables reflect data as of the year 2000, but I doubt much has changed. The generous country I thought I grew up in has either vanished … or perhaps it never existed.

But one aspect of the above maps worries me … the attribution of malnutrition to climate change.

Brazil doubled its cereal production between 1990 and 2003 with only a 35% rise in human population, it was awash with food. During the same period the proportion of Brazil’s cereal going to feed livestock went from 44% to 57%. Asia between 1990 and 2003 experienced a surge in livestock feeding between 1990 and 1995 going from 15% of cereals to 19%. The lower rate probably reflects the Asian preference for chicken and pork over beef. In any event, this fraction persisted until at least 2003. Indonesia and China dominate the Asian picture and both had a surge in corn production during the early 1990s, with the only beneficiaries being livestock. Total Asian cereal production, imports and and livestock feed ratios moved little between 1995 and 2003, despite a rising population. But the rising use of food for feed elsewhere in the world meant reductions in food available (and possibly affordable) to meet the short fall. The result was that undernourishment increased in Asia … exactly as the UN SOFI report finds.

Australia’s grain production goes up and down like a yo-yo so its difficult to discuss food/feed ratios on a yearly basis. But the amount of grain used as feed in 1990 was about 4 million tonnes, in 1995 it was 6 million, by 2003 it was 7.6 million and by 2006/7 it had surged to 12 million. So all up, Australians eat about 2 million tonnes, feed an increasing amount to livestock which leaves a steadily shrinking volume available for export.

The spread of western meat based diets globally has been accompanied by a spread of factory farming, obesity and chronic disease together with a change in the world’s livestock distribution. Factory farming now produces the bulk of the world’s 98 million tonnes of pigmeat and factory farms are high capital operations which demand, and can pay for, a consistent feed supply chain. They can outbid the world’s poor and turn food into feed and food producers into feed producers in exactly the same way that coffee drinkers turn food growers into coffee growers. While it is perfectly reasonable for any country to have a mix of food and cash crops, its the balance that matters.

Between 1984 and 2004 the world’s cattle population fell by 25% in the developed world but increased by a similar proportion in the developing world. This means that of the world’s 1.33 billion cattle, over a billion are in the developing world. Brazil has 190 million, Sudan and Colombia have 41 and 26 million cattle respectively and all three get a mention in the SOFI report with Brazil still having 12% undernourishment in 2004-6 despite a veritable glut of food production capacity.

Globally, this conversion of food to feed to drive increasing meat consumption accounts for the increase in undernourishment without requiring much, if any, input from climate change. As the better off eat more meat, they create a livestock industry which can outbid the poor for food.

But in Australia, our red necked BBQ culture reigns supreme. It’s impacts are felt in poor countries who can no longer buy as much of our grain because is has been siphoned off to feed livestock. Our culture is felt also in rich countries who buy our beef and get bowel cancer and heart disease as a result. We will continue to focus our ethical might on the sexual peccadillos of our politicians and our environmental muscle on plastic bags.

October 14, 2008

The global food system and climate change – Part I

Filed under: Livestock's long shadow — Barry Brook @ 10:53 am

Guest Post by Geoff Russell.

Geoff is a mathematician and computer programmer and is a member of Animal Liberation SA.

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Late in 2006 the United Nations Food and Agriculture organisation published one of those huge thick reports that gets a one column story in quite a few newspapers and then vanishes from sight. It is Livestock’s Long Shadow (LLS).

The report is a compendium of data and analysis on the impacts of the livestock industry on the earth’s eco-systems. There are major chapters on land degradation, air pollution, water pollution, biodiversity, with concluding chapters on policy options for reform and expansion.

This is the first of a few posts which will review major parts of the report. I’m not aiming at an comprehensive review, but rather at presenting key pieces with other relevant information which should allow people to appreciate the linkages between the global systems of food, feed, livestock and their impact on climate change. Remember always that food is what people eat, and feed is what livestock eats. We will begin by looking at the first two LLS chapters which provide structural background for the remainder of the report.

Keep in mind that LLS is written by people advocating an expansion of the livestock industry while I advocate a reduction. Hence my choice of the term factory farm instead of the more euphemistic intensive/landless used in LLS.

Let’s start with a couple of tables which serve to give an overview of the structure of the global livestock system. These tables will also show that the Australian livestock industry is somewhat unusual.

Global Livestock Output

The first table is a who’s who of agricultural commodities. Most of us live in a single dwelling and buy major items of metal, wood or plastic infrequently, but we all eat everyday and the global ebb and flow of food largely determines our appropriation of the planet’s resources. Forestry, for example, causes just 3% of Amazon deforestation. In Australia, we have cleared 100 million hectares since white arrival, but forestry operates in just 13.3 million hectares, most of which are not cleared. We crop just 24 million hectares and urban areas occupy just 1.6 million. Here as elsewhere livestock is the primary driver of land clearing and biodiversity loss.

Meat Production Millions of Tonnes

Production System

Grazing

Rainfed/Mixed

Irrigated/Mixed

Factory Farm

TOT.

%

Mutton

3.8

4.0

4.0

0.1

11.9

4.9

Beef

14.6

29.3

12.9

3.9

60.7

25.1

Poultry

1.2

8.0

11.7

52.8

73.7

30.5

Pork

0.8

12.5

29.1

52.8

95.2

39.5

TOT.

20.4

53.8

57.7

109.6

241.5

%

8.4

22.3

23.9

45.4

Food and Feed Production Millions of Tonnes

Cereals

1886

Roots/Tubers

692

Soybeans

220

Fruit/Veg

1336

Fish, Seafood

128

Fish-meal

7.6

Palm/Soybean Oil

70

The data I’ve assembled in this table is an amalgam of parts of LLS Table 2.9 with a little data from the FAO and the US Department of Agriculture on plant food and seafood. The palm oil/soy oil figure of 70 megatonnes comes from USDA. It is faily evenly split between the two oils. The fish-meal figure is from LLS but was checked against with the International Fishmeal and Fishoil association. They give a similar figure and the implication is that global fish-meal, created annually from 30-35 million tonnes of fish, is entirely consumed by livestock (including aquaculture). LLS explains that as aquaculture expands it requires fish-meal, because the fish of choice, like tuna and salmon are carnivorous and require fish in their diet. Despite what you may have heard, people don’t need to eat sea food of any kind. As aquaculture diverts fish-meal from livestock feed, this leaves a hole filled increasingly by soy.

The top section of the table is meat production, the bottom is the major components global plant production, which is a combination of food and feed. We will see later just how much of this production is appropriated for feed.

This is a complex and dense table and we will spend a little time highlighting things that an Australian might find surprising. It is customary to quote meat figures as carcase weights. But you only eat 60-75% of the carcase, so the edible meat will be somewhat lower than this table indicates.

There are 4 kinds of production systems. The two in the middle are mixed systems. These are farms which grow some or all livestock feed for the animals they produce. This implies that some or all of the farm is suitable for crops — arable. A factory farm gets all its feed from somewhere else. So a factory farm competes with humans for the plant food products at the bottom of the table. Absent from the bottom of the table are fodder crops. These are important in many livestock systems. Australia, for example, has an area of irrigated hay and silage production about 50% bigger than our entire irrigated fruit growing areas. In 2005/6 we applied 770 giga litres of irrigation water to this area, which is about 100 giga litres more than we applied to fruit trees. Global fodder figures are missing from LLS but we will revisit the issue when we deal with Chapter 4 of LLS and water issues.

In Australia about 2/3 of beef and half of our dairy products are exported. Ignoring that, beef and chicken consumption are similar with pork being about half the size. Globally on the other hand, pigs dominate the meat industry and chicken production is bigger than beef. In Australia, almost all pig and chicken meat is produced in factory farms.

So the Australian meat production profile, with its beef dominance, is rather different from the global average. But since chicken and pig meat outsells beef locally, over half the meat consumed in Australia is produced in factory farms. Globally, factory farmed meat is just under half of all meat.

The total global production of 241.5 million tonnes sounds like a lot of food. The UN Food and Agriculture Organisation also keeps accurate data on plant food production and contains what are called Food Balance Sheets on its statistical website. If you take the production figure, add the imports, subtract the exports and animal feed, you get the amount of each food left for people to eat. Divide this amount by the population and you get the calories per person per day.

All up, animal food, which also includes fish, milk and cheese, provides 17% of the daily average of 2808 calories. If you think that protein would be a more flattering measure of the value of animal production then you would be right. But until very recently in human history, a diet with adequate calories provided adequate protein. These days, a diet of coke and fries can simultaneously make you obese and protein deficient. For more background on protein see the section below.

Global Inputs

The LLS map on the left shows the distribution of livestock production systems which provide this 17% of global calories. Livestock graze 26% of the ice free surface of the planet, about 3.4 billion hectares (about 4.4 times the area of Australia). But we can see from the above table that this vast amount of grazing land produces a fairly small proportion of global meat. A grass fed cattle carcase in Australia or from the Brazilian Amazon comes in at 200-250~kg. But a grain fed feedlot animal produces a 350~kg carcase.

In addition to pasture, livestock consumes the output of 471 million hectares of the crop land. This is about one third of all current crop land shown on the left.

All up then, animal foods use 471 million hectares of crops + 3,400 million hectares of grazing + the entire and declining output of both fresh water and ocean fisheries but provide just 17% of global calories. Plant foods provide 83% of global calories from 940 million hectares of crops. Based on current cropping outputs, if people switched to totally plant based diets, we could return the full grazing area of 3,400 million hectares to other species, together with a significant proportion of the 471 million feed hectares. At the other extreme, if the entire 6.7 billion of the world’s population ate like the richest 1.4 billion, then massive increases in both grazing and cropping areas will be required.

Food becomes feed

Feed use in 2002 (million tonnes)

Developing Developed
Commodity countries countries Total

Grains

226.4

444.0

670.4

Brans

92.3

37.0

129.3

Oilseeds/pulses

11.6

15.7

27.3

Oilcakes

90.5

96.6

187.3

Root/Tubers

57.8

94.4

152.4

Fish meal

3.8

3.8

7.6

TOTAL

482.4

691.7

1,174.3

Biofuels

100.0

Now we are ready to look in a little more detail at the global feed consumption of livestock. So here it is, together with an added row giving the total biofuel use of grains in 2007. As you can see, the biofuel contribution to the current global food crisis is pretty much a straw on the back of a camel laid low by the burden of global meat production.

The oilcakes row is interesting. Oilcakes are a byproduct of making oil from soybeans, peanuts or various other oil yielding plants. Oilcake is typically very high in protein and minerals. Overall, LLS estimates that 77 million tonnes of protein is fed to animals in food suitable for humans for an output of 58 million tonnes.

Australian Grain Feeding

2005/6 million tonnes

Feedlot Cattle

3.542

Broilers

2.357

Layers

0.404

Pigs

1.587

Dairy

2.228

Grazing Sheep/Cattle

0.371

Total

10.734

Source: ABARE Feedgrains report 2007

Of course, when the global food crisis hit in early 2008, even Oxfam jumped on the blame-biofuel bandwagon while ignoring the industry which supplies the beloved Aussie BBQ. How much food do we use as feed in Australia? Here are stats from 2005/6. In the following year, 2006/7, because of ongoing drought in Australia, we imported about 2 million tonnes of feed grains. So, in a very real sense we helped to exacerbate the global food crisis in two ways. First with the import of grains, and second by the normal use of about 11 million tonnes annually to feed cattle, pigs and chickens.

Deforestation and land degradation

This map shows the global area regarded as either vulnerable (yellow) or critically affected (red) by livestock.

Unsurprisingly, LLS cites land use change as the leading cause of global biodiversity loss. Clear a forest for soybeans or cattle and the plants and animals of that forest will die. But of course, we reasonably put out own own need to eat above that of wildlife, but we can choose to minimise the damage. Or not.

LLS describes the mechanisms whereby livestock damage land. On rangelands, we have the holy trinity of extensive livestock production with which any visitor to the Australian outback who knew what to look for would be familiar: desertification, increased woody plants, and deforestation. Queensland’s destruction of Brigalow forests during the 1990s was particularly savage. On a per-capita per-hectare basis, this deforestation surpasses anything in Brazil or Indonesia – the two acknowledged superpowers in the deforestation race.

Factory farms produce different environmental problems. Any damage done during cropping for feed production should be attributed to them and not to plant food production. Water pollution can cause eutrophication, ground water contamination, red tides, blue-green algae and dead zones. Such events can have non-livestock causes, but modern livestock numbers can easily impose intolerable loads on natural systems.

In the US, there is often better data available than elsewhere and LLS presents a figure of 55% as the amount of erosion on both crop land and pasture which is due to livestock either directly or via feed production. This erosion and loss of topsoil has the potential to cause a crisis in global food production that will make this year’s crisis seem insignificant.

Typically, the manner of deforestation is more complete for crops than than cattle. So the obvious question is whether it preferable to clear a small area completely or to clear a much larger area, but less intensively, for grazing?

Forest and Soil Carbon Distribution (tonnes/ha)
Above ground Below ground
Wet Tropical Forest

130

213

Grasslands

0.4-3.8

30

This table isn’t from LLS, but from a key study into grazing systems relied upon by LLS (Asner et al, “Grazing Systems, ecosystem responses and Global Change”). It shows figures for above and below ground carbon for a tropical forest and grassland. Clearly, a grassland is a poor substitute for a tropical forest as a carbon store. In between grasslands and wet tropical forests are all manner of woodlands with values anywhere between these extremes. When a tropical forest is cleared, it isn’t only the above ground carbon which is lost, much of that below ground may be lost over coming years. Cattle grazing tropical soils compress the ground as elsewhere, but the result can end up with decomposition becoming anaerobic and the soil can become a methane source. More on this later in this series.

The basic transformation of livestock production during the past 50 years has been driven by the simple fact that grasslands which are both available and suitable for grazing are already used. They are not only used, they are frequently degraded. In Australia, we don’t need global studies like LLS to tell us about either deforestation or degradation. We are world leaders in both.

This map shows areas which are both highly suitable and available for grazing. I’ve shrunk the map, but the green areas are forest areas, the yellow are crop areas and the red are urban areas which are currently on land suitable for grazing.

As a result, increases in meat production that have been achieved during the past half century have been due to intensification or deforestation.

Jared Diamond estimated back in the late 1990s in “Guns, Germs and Steel” that gatherer/hunters need 10 to 100 times more land than farmers. Similarly, extensive livestock need more land than intensive livestock, for similar reasons. Most native grasses are, or have been thought to be, less than optimal for maximising livestock growth, so if you want maximum growth, grow the feed elsewhere (or locally) using intensive methods with plenty of water if possible, and fertiliser. Alternatively sow your pasture with grasses selected for maximum productivity and add fertiliser. Australia spent 70 years introducing 5000 species of grasses and legumes in an attempt to improve on native grasses for livestock growth. Fertilisation of non-irrigated pasture is common. In 2005, for example, non-irrigated pasture uses 39% of total nitrogenous fertiliser in New South Wales, 35% in the Northern Territory, 60% in South Australia and 44% in Victoria.

Apart from intensification, the second key to the increase in meat production over the past 50 years has been increased is by shifting from biologically inefficient feed converters, large ruminants, to efficient feed converters, pigs and chickens. The third key to increased production has been a spatial shift. Cattle grazed on rangelands have to be moved to where the consumer lives, typically nowhere near the rangelands. Pigs and chickens are kept in huge sheds fairly close to cities. It is far more efficient to ship feed to factory farms than to ship live animals to abattoirs.

In the next post, I’ll get down to the detail of climate change impacts of the food system in general and livestock in particular.


Nutritional Appendix

We showed earlier that feeding the global population with plant food would release huge amounts of grazing land for other species and even some cropping land. This is an extreme in the spectrum of possible change and has a low social feasibility. But this post is only concerned with scientific feasibility. To show that this is scientifically feasible, we need to show that, contrary to popular belief, animal protein has no practical advantages over the plant proteins found in standard plant staples like, for example, wheat, beans or rice.

The Australian National Health and Medical Research Council’s 2006 Nutrient Reference Values of Australia and New Zealand lists protein requirements without distinguishing plant and animal protein requirements. This is because there are no relevant differences between plant and animal protein where food intake is adequate. And when food intake isn’t adequate? What then? The weapon of choice at present in saving malnourished children is a product called Plumpy’Nut. It is basically a fortified peanut butter. Compared with traditional fortified milk based products, the peanut based formula works better (restores growth and health faster), is less prone to infection with pathogenic bacteria, is cheaper and doesn’t look like milk. The latter is an advantage because health workers have a hard time persuading mothers to breast feed when the treatment for malnutrition looks like milk (Am J Clin Nutr 2003;78:302-7).

It is worth quoting one last statment on the adequacy of plant based diets from the Professor of Nutrition at New York University, Marion Nestle, who happens not to be a vegetarian, who states in her recent book What to Eat: “The meat industry’s big public relations problem is that vegetarians are demonstrably healthier than meat eaters.”

This of course is a statistical statement. Vegans and vegetarians consuming frequent meals of coke and fries will get sick just like anybody else eating too much of these foods.

So how much protein does animal food currently provide? All up, despite using 33% of arable land plus a massive grazing area, animal food production only supplies 38% of the daily average of 76 grams of protein for each person on the planet. This is likely to be an overestimate because of the use of carcase figures in the data. However animal food distribution is not uniform and makes up far more of the diet of the 1.4 billion people in the developed world with animal protein being about 50% of all protein. Animal protein is about 30% of protein in the other 5.3 billion people on the planet.

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