Showing results for: Carbon footprint
Michelle Cain, Myles Allen and John Lynch of the University of Oxford have published a plain-language briefing note that explains how different ways of measuring the climate impact of methane (GWP100 versus GWP*) affect definitions of net zero emissions targets.
This paper sets out a new method to account for nutrition in the functional unit of life cycle assessments of single foods. The method accounts for the wider dietary context of each food type, which is found to affect the results relative to using either mass as a functional unit, or another nutrient-based functional unit that does not consider the dietary context.
This paper by FCRN member Elinor Hallström assesses the nutritional content and climate impact of 37 seafood products. The paper finds high variability in nutritional and climate performance, with no consistent correlation between nutrition and climate impact across different seafood species. The paper calls for dietary advice to promote species with low climate impact and high nutritional value, including sprat, herring, mackerel and perch.
This report from the UK’s Committee on Climate Change sets out how the UK can reach net zero emissions by 2050 using existing technologies. It notes that current policies do not do enough to meet existing climate targets, and calls for “clear, stable and well-designed policies” to be introduced across the economy without delay. If replicated across the world, the plan would give a greater than 50% chance of limiting warming to 1.5°C.
This paper traces mass, energy flows and emissions in the beef, poultry and pork supply chains in Germany (including all emissions from the animal production stages, and emissions from energy use at subsequent stages). It outlines the potential of different strategies to reduce consumption-based emissions. It finds that the greatest emissions reductions could come from dietary change, i.e. replacing some meat consumption with consumption of soybeans and nuts, or replacing some meat consumption with offal consumption.
FCRN member Christian Reynolds uses linear programming to calculate diets that meet both health and greenhouse gas emission criteria while being affordable for different income groups in the UK. Generally, the optimised diets are higher in plant-based foods than diets consumed in the UK in 2013, although seafood is higher in the optimised diet than in 2013 diets.
The UK’s Food and Drink Federation (FDF) has published its 2018 environmental progress report. FDF members report a 53% reduction in their greenhouse gas emissions from energy use in manufacturing operations since 1990, and a 39% reduction in water consumption since 2008.
This paper, by John Lynch of the University of Oxford’s LEAP project, finds that carbon footprint studies of beef cattle typically do not report separate values for emissions of different greenhouse gases such as methane and nitrous oxide. Instead, studies generally report only an aggregated figure in the form of the 100-year Global Warming Potential (GWP100) as CO2-equivalent.
This paper, by researchers from the University of Oxford’s LEAP project, models the climate impacts of beef cattle and cultured meat over the next 1000 years using a climate model that treats carbon dioxide, methane and nitrous oxide separately, instead of using the widespread Global Warming Potential, which assigns a CO2-equivalent value to each greenhouse gas according to warming caused over a specified timeframe.
FCRN member Diego Rose has written a paper on the links between dietary choices in the United States (based on real dietary data), environmental impacts, and nutrition quality, finding that the diets with the lowest greenhouse gas emissions per calorie generally scored better on the US Healthy Eating Index.
This paper models the system-wide changes and consequent shifts in pre-retail greenhouse gas emissions that might result from introducing a Europe- or North American-style refrigerated food chain to sub-Saharan Africa. Total emissions might increase or decrease, depending on the scenario.
This paper presents a ‘carbon benefits index’ to measure how land use change contributes to global carbon storage and reduction in greenhouse gas emissions. The index accounts for both the carbon that could be stored if the land were reforested, and the carbon emissions of producing the same food elsewhere.
People tend to underestimate the greenhouse gas emissions and energy use associated with different food types, according to this paper, but are likely to buy lower-emission food types when provided with information on greenhouse gas emissions.
Non-profit organisation Ceres has produced an overview of resources (standards, methodologies, tools, and calculators) for assessing greenhouse gas emissions from agricultural production and agriculturally-driven land use change.
So-called natural climate solutions in the United States (such as changing management of forests, grassland and agricultural land) could create annual emissions savings equivalent up to 21% of current US emissions according to this paper.
This paper calculates the carbon footprints of food supply across different European Union countries. Annual footprints vary from 610 to 1460 CO2 eq. per person, with Bulgaria having the lowest footprint and Portugal having the highest footprint. Meat and eggs account for the largest share of the carbon footprint (on average 56%), while dairy products account for a further 27%.