Organic Agriculture and Climate Change

• Other Authors: Znaor, Darko
• Format: Conference Object
• Language: English
• Published: Avalon Foundation 2009
• Subjects: Food security; food quality and human health; Systems research and participatory research; Nutrient turnover; Social aspects; Air and water emissions; Soil; Policy environments and social economy; Environmental aspects; Ice; permafrost; Sea ice
• Online Access: https://orgprints.org/id/eprint/26390/

The problem Climate change is one of the most challenging issues the mankind faces today. The Earth is warming up! The burning of fossil fuels, the cutting of forests and environmentally – unfriendly farming practices are the key reasons why the average temperature of the Earth’s surface has risen by 0.74 °C since the end of the 19th century. The temperature rise causes glaciers, permafrost and sea ice melting. It disturbs and destroys ecosystems and species, causes sea levels rising, seasons changing and more extreme weather, resulting in more frequent flooding and drought, more disease, more famine and hundreds of millions of environmental refugees. The role of agriculture Contrary to most other sectors, agriculture is both the source of greenhouse emissions (GHG) and a likely victim of climate change. Agriculture is a significant source of two greenhouse gases: nitrous oxide and methane. Agricultural soils and livestock directly emit GHG, while agriculture’s indirect emissions include fossil fuel use in farm operations, the production of agrochemicals and the conversion of land to agricultural use from forests. Agricultural direct emissions globally make up 14% of all anthropogenic GHG emissions. However, the total global contribution of the agricultural sector, including all direct and indirect emissions, is in the range of 17%-32% of all global human – caused GHG emissions. Livestock farming and fertiliser use are by far the two most significant sources of GHG deriving from agriculture. Through enteric fermentation in the rumen, ruminant livestock (cattle, sheep and goats) produce methane, contributes to about 60% of all global methane emissions. Additionally, both methane and nitrous oxide are emitted from the storage, application and decomposition of manure in the soil. Nitrogen fertilisers applied on agricultural land emit nitrous oxide, a gas whose global warming potential is nearly 300 times greater than of CO2. Besides livestock farming and fertilisers, agriculture emits GHG through the production of ...