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The problem with the headline about vegetarianism is that it suggests that the world is one unit, and that somehow resource constraints would affect the world in a more or less uniform way. Barring the emergence of some centralized global government, this won’t happen. Some people will always be able to afford meat and will consume it. In 50 years, some people will probably still eat as much as modern Americans. The question is how are we going to create a world that is food secure for billions. I’m very confident that we will go through multiple advances in crop science, etc. that will allow us to feasibly grow more than enough food for 9 billion people. Imagine 6-10 tonnes of harvest per hectare. I’m 100% a techno-optimist in that regard. I’m not, however, optimistic that we are guaranteed to sort out how to ensure that people are food secure, meaning that the food that is produced can reach people who have the purchasing power to acquire it. Ultimately, “food security of billions” will boil down to the ability of those billions to purchase  what they can’t grow themselves, and that is a complicated issue that was addressed by Malin Falkenmark in her talk(s), but by very few others

understanding how governments, private entities, etc. induce changes in human behavior. Governments tend to use the strong arm of the law, rather than creative incentives. Private companies on the other hand, have a very well-practiced and nuanced marketing sense, because they have to if they want consumers to purchase their products. Its surprising to me then that Nestle and PepsiCo the two mega-large corporate sponsors/ participants in this year’s World Water Week didn’t collaborate and host a special session on human behavior change, in a very applied practical sense

I’m excited by a “new” effort to develop an international standard method (ISO) for water footprinting assessments. I was at first fascinated by the idea of looking at “embedded water” in products, also known as the virtual water content of a product. A popular quote is 1000 litres of water to make 1 litre of milk, or 16000 litres of water for 1 kilogram of beef. National Geographic has created posters, and World Water Week’s corridors had large displays showing us how much water was required to make various food items and beverages. However, what does any of that mean? In what context was that beef grown? Are you assuming it was grain fed on a feedlot or grass fed in a country hillside? Are these beef cattle eating grain grown in tropical drylands (e.g. the Sahel in Africa), or temperate rainy areas (i.e. the Pacific Northwest of the USA)? Those details can make the difference between completely unsustainable and completely sustainable methods of food production. If the ISO standard can serve to improve the transparency and usefulness of the concept of water footprinting, then that would be an important achievement.