While energy and transport often dominate climate change discussions, the food system is a massive contributor to global warming. Globally, food systems account for approximately 30% of greenhouse gas emissions, but in Australia, this figure is closer to 40%. A significant portion of these emissions comes from livestock (methane from cows) and food waste. If cows were a country, they would be the third-largest emitter in the world, tied with 'The Republic of Food Waste.' Addressing these emissions requires looking beyond just the farm to the entire value chain, including fertilizer production, transport, and waste management.
Australian government departments and national science agencies monitor agricultural emissions and climate targets.
Phosphorus is a non-renewable element essential for all life and food production; there is no substitute for it. However, global supply is precarious, with just five countries controlling around 83% of the world's remaining phosphate rock reserves. Australia is particularly vulnerable as it has ancient, phosphorus-deficient soils and is the world's fifth-largest importer of phosphate. Supply disruptions, such as those caused by geopolitical conflicts or pandemics, can lead to massive price spikes (up to 400%), threatening farmer livelihoods and food security. The solution involves improving efficiency and recycling phosphorus from food waste and wastewater.
Specialized research institutes within Australian universities and industry bodies track nutrient security and supply chains.
To tackle issues like waste and resource scarcity, agriculture must transition to a circular economy. This model relies on three pillars: minimizing waste, keeping products in circulation, and restoring nature. Practical applications include 'renewable fertilizers' derived from recovered organic waste (like manure and sewage) and shifting business models from selling products to selling services (e.g., selling 'soil health' rather than bags of fertilizer). These solutions offer 'stacked benefits,' such as improved water security, reduced reliance on imported fertilizers, and lower carbon emissions.
Australian sustainability hubs and agricultural departments provide resources on circular economy strategies.