The food system has been estimated to account for between one quarter to one third of global greenhouse gas emissions, making the food system one of the most significant contributors to climate change. The problem begins on the farm. Soil and land management, as well as livestock rearing, account for a large portion of these emissions. For example, forested areas that act as carbon sinks are being cleared for agricultural land, turning the land into a carbon source. As soil is prepared for new harvests or left bare between harvests, carbon is released into the atmosphere. Methane is also released into the atmosphere through the manure left by livestock. Rather than growing food for communities to eat, much of this agricultural land is devoted to growing feed for livestock, biofuels or industrial ingredients for processed food. The result is that increasing amounts of fertile land are being used for energy-intensive and emissions-generating operations, which often don’t even end up on our plate.
Emissions are also released during every phase of a food’s journey from farm to plate, including through multiple, long transportation routes, energy-intensive storage and plastic-heavy packaging. If the food ends up as food waste, not only is the value of the inputs wasted, but it becomes a source of emissions itself as it is incinerated or decomposed in landfills.
Besides its contribution to climate change, the food system also plays a harmful role in environmental degradation - again, significantly at the farm level. Poor land management, soil erosion, pollution from chemical inputs, such as fertilizers and pesticides, depletion or contamination of water sources and impacts from mechanized production, are a handful of the problems that lead to ecosystem destruction around farmland. With unsustainable agricultural practices, the ecosystem loses resilience, resulting in decreased biodiversity and increasing soil infertility. In short, our current food system intakes a huge amount of resources, outputs greenhouse gas emissions and destroys the environment - all of which endangers our future ability to produce quality food.