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In the world we are 7.7 billion people and we produce food in order to nourish the 3.4 in a sustainable way
MORE than half of the production of food globally is unsustainable and actually harmful to our Planet. To say it is a five-year analysis just published on Nature Sustainability. Scholars have at the same time identified a package of solutions that, if applied, would ensure the livelihood of more than 10 billion people. we Produce food and with environmental costs soaring food Security for all without altering the Nature. It is one of the most difficult challenges of the coming years and the researchers of the Potsdam Institute for Climate Impact Research (PIK) wondered how to deal with it. "In order to produce food are affecting the ecosystem," explains the Professor Dieter Gerten , lead-author of the study - the situation is serious, but there is still time to change by acting as soon as possible". The analysis starts from the so-called "Theory of the 9 planetary borders" as formulated in 2009 by the geophysical Swedish Johan Rockström : nine thresholds of environmental human activity should not exceed to maintain intact the Planet. Scientists have established how many people you can feed without exceeding these limits date technology, diets and socio-economic conditions current. In detail, the team directed by Gerten has examined four of the nine boundaries, those directly connected to food production: the maintenance of biodiversity, the sustainable use of fresh water, the appeal is limited to nitrogen, in agriculture and deforestation practices. Based on various simulation models, the work shows how the current food system is able to provide a balanced diet (2,355 kcal per capita per day), to only 3.4 billion people. The work quantifies for the first time, the unsustainability of the present rate of exploitation of food resources. the "Rethinking the food system" The diagnosis is merciless, but scholars who suggest the cure. "Subtract land for farming and intensive cultivation, fertilizziamo and irrighiamo too much to the peril of the water cycle, these are the main problems," says Gerten. And he continues: "To solve them, you need to completely rethink the food supply chain.". According to the researchers, in fact, the only reorganization of rational farming techniques that would ensure a sustainable food for the 7.8 billion people, slightly more than the current population.
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