Humanity’s “Need” for “Food” in 2050

, scientific adviser, Climate and Energy | August 18, 2015, 10:57 am EDT
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Perhaps the most viral meme in the discussion about global food and agriculture has been that we will need to produce at least 60% more food in 2050. This statement has been repeated hundreds and perhaps thousands of times in the past decade, often as the introduction to articles, speeches and web postings explaining why it’s necessary to raise agricultural production, whether by using GMOs, clearing forests, or totally revolutionizing the global food system.

While the number varies (sometimes it’s 70% or “doubling” or other variations) as does the exact phrasing (often it includes phrases like “to feed our rapidly growing population”, the message is one of urgency and often alarm.

But what exactly is the analysis that this statement is based on? I delved into this, tracing the statement back to its original sources, and found some surprising discoveries. (For a different and much more extensive critique, see the September 2013 report by Tim Wise of Tufts University.)

The first surprise was on something quite simple: how was food measured? Naively, one might think that you’d measure food by weighing it, so that the 60% figure meant 60% more kilograms, pounds or tons. A little more sophisticated approach could be to look at the amount of energy in the food, which would mean measuring it in calories. This would take into account the fact that some foods (e.g coffee or celery) have very little energy, while others (e.g. rice or pork) have considerably more, so that their weights are a good reflection of their value for human growth and survival. Other possibilities could include weighting foods by their protein content, or other important nutrients such as phosphorus, calcium or vitamins.

But it turns out that none of these are the case. Rather, the unit of measurement for the calculation, is dollars.

How can that be? What does it mean say that the global population will need to consume many more dollars of food in 2050?

The answer is that this is an economic projection, not an estimate of need. (That’s why I put the scare quotes around “need” in my title). The authors who did the calculation – FAO experts Nikos Alexandratos and Jelle Bruinsma, for successive publications in 2006, 2009, 2012 and 2013 – made this quite clear. Here is a quote that is repeated verbatim in their 2006 and 2012 reports:

“The figures we use refer to the aggregate volume of demand and production of the crop and livestock sectors. They are obtained by multiplying physical quantities of demand or production times price for each commodity and summing up over all commodities.”

And, in more detail:

“The figure 70 percent from average 2005/7 to 2050 has been widely quoted. It is important to realize what it means: when speaking of growth rates of aggregate agricultural production or consumption, it matters what units are used in the measurement of change, in particular whether quantities of the different commodities are just aggregated in physical units …. or aggregated after making them homogeneous by multiplying each quantity with an appropriate weighting factor and summing up. The weights often considered are food-specific calorie content of each commodity (e.g. kcal per kg.) or price. ….This study uses the international dollar prices of 2004/06 …. the physical weight aggregation would not make sense and the same goes for calorie weights.”

So the authors are quite clear: this is a projection, in economic units, of the global demand for food. It weights foods not by how many calories or how much protein they contain, but by their prices.

What does this mean for the total, and thus for the percentage increase? It turns out that the prices of different kinds of foods, in dollars per kilo or per pound are very different. Here, for example, were the U.S. export prices of different foods in July 2005, indexed by taking maize (corn) as equal to 1.0:

Beef 33.0
Pork 17.0
Poultry 6.7
Wheat 1.9

In other words, this way of doing the calculations counts meat, and particularly beef, way out of proportion to its calorie or protein content. So that as global diets shift towards more meat as incomes increase, the projection of “need,” done in dollar terms, will go up.

The FAO economists don’t make any secret of this, so I don’t fault them for the extremely common misinterpretation of their number. Or rather, I only fault them (and the FAO) slightly : their expressions did slip somewhat in successive publications, from using neutral words like “projection” to others that seemed to imply necessity. Here are examples, with the boldface font added by me:

FAO 2006: “At the world level, the growth of demand for all crop and livestock products is projected to be lower than in the past, 1.5 percent p.a. in the period 1999/01-2030 and 0.9 percent for 2030-50 compared with rates in the area of 2.1-2.3 percent p.a. in the preceding four decades.”

FAO 2009: “The projections show that feeding a world population of 9.1 billion people in 2050 would require raising overall food production by some 70 percent between 2005/07 and 2050.”

FAO 2012: “…global production in 2050 should be 60 percent higher than that of 2005/2007.”

CGIAR/FAO 2013: “FAO estimates that global agricultural production in 2050 will need to increase by at least 60 percent relative to 2006, a growth rate of just less than 1.2 percent annually.”

Nonetheless, many others have use the the figures in different and often misleading ways. Here are just a few examples:

The Economist 2011: “..total demand for food will rise about 70% in the 44 years from 2006 to 2050, more than twice as much as demand for cereals.” (The Nine Billion-People Question, 26 February 2011, p. 4)

National Geographic 2014: “By 2050 the world’s population will likely increase by about 35%…. To feed that population, crop production will need to double.” (Feeding Nine Billion, May 2014, p. 45)

And, from Monsanto’s website, a version that is rather different but appears to be based on the same calculations:

From the Monsanto web page on "Feeding the World", a related but different version. SOURCE: http://www.monsanto.com/improvingagriculture/pages/feeding-the-world.aspx

From the Monsanto web page on “Feeding the World”, a related but different version. SOURCE: http://www.monsanto.com/improvingagriculture/pages/feeding-the-world.aspx

More food in the next 50 years than in the past 10,000, during a 40-year period  in which global population is projected to increase by less than 40%? Hard to believe, if it’s kilos or calories of food – but perhaps the case if you measure food in dollars. (That’s why my blog title not only has “need” in scare quotes, but “food” as well).

One might say that the error in interpreting the FAO projection was “hiding in plain sight” – all I had to do was read the original studies to find that it was a dollar figure, not a measure of need. In fact, given the authors’ repeated attempts to correct the misinterpretation, I’d go further. It was not only hiding in plain sight, but shouting out loud, “Hey, here I am!” So, why do we keep repeating the mistake?

Posted in: Food and Agriculture, Global Warming, Science Communication, Tropical Forests Tags: , , , , ,

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  • plgepts

    So what is the answer then, if not 60-70-100% And are alternative such as the amount of calories, which seems the way of justifying the current overemphasis on cereal and oil crops, any better? Can an index be developed on a diversified diet?

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  • Barbara Watts

    Perhaps the mistake will keep being made until an analysis on the basis of calories or some other variable is made and widely known? What IS the answer to the original question of Humanities real need for food in 2050? Or is that not the important question at all?