Ruminant livestock – mainly cattle – for example, produce methane through their digestive processes. We can break these food system emissions down into four broad categories:ģ0% of food emissions come directly from livestock and fisheries. This includes emissions from land use change, on-farm production, processing, transport, packaging, and retail. But as the review above showed, despite this uncertainty, most analyses tend to converge on an estimate of close to half of habitable land being used for agriculture.įood is responsible for one-quarter of the world’s emissionsįood systems are responsible for around one-quarter (26%) of global greenhouse gas emissions.That can make it difficult to accurately quantify how much rangelands are used for grazing, and therefore how much is used for food production. The intensity of grazing on rangelands can vary a lot. Rangelands are grasslands, shrublands, woodlands, wetlands, and deserts that are grazed by domestic livestock or wild animals. The difference in these figures is often due to the uncertainty of the size of ‘rangelands’.83% of this is used for animal-sourced foods. The study by Joseph Poore and Thomas Nemecek (2018) estimates that 43% of ice- and desert-free land is used for agriculture.6 This left only 45% as ‘natural’ or ‘semi-natural’ land. (2010) found that by 2000, 55% of Earth’s ice-free (not simply habitable) land had been converted into cropland, pasture, and urban areas.
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