Feasibility of mitigation measures for agricultural greenhouse gas emissions in the UK. A systematic review

Abstract

The UK Government has set an ambitious target of achieving a national “net-zero” greenhouse gas economy by 2050. Agriculture is arguably placed at the heart of achieving net zero, as it plays a unique role as both a producer of GHG emissions and a sector that has the capacity via land use to capture carbon (C) when managed appropriately, thus reducing the concentration of carbon dioxide (CO2) in the atmosphere. Agriculture’s importance, particularly in a UK-specific perspective, which is also applicable to many other temperate climate nations globally, is that the majority of land use nationwide is allocated to farming. Here, we present a systematic review based on peer-reviewed literature and relevant “grey” reports to address the question “how can the agricultural sector in the UK reduce, or offset, its direct agricultural emissions at the farm level?” We considered the implications of mitigation measures in terms of food security and import reliance, energy, environmental degradation, and value for money. We identified 52 relevant studies covering major foods produced and consumed in the UK. Our findings indicate that many mitigation measures can indeed contribute to net zero through GHG emissions reduction, offsetting, and bioenergy production, pending their uptake by farmers. While the environmental impacts of mitigation measures were covered well within the reviewed literature, corresponding implications regarding energy, food security, and farmer attitudes towards adoption received scant attention. We also provide an open-access, informative, and comprehensive dataset for agri-environment stakeholders and policymakers to identify the most promising mitigation measures. This research is of critical value to researchers, land managers, and policymakers as an interim guideline resource while more quantitative evidence becomes available through the ongoing lab-, field-, and farm-scale trials which will improve the reliability of agricultural sustainability modelling in the future.

Long-Term Effects of Different Tillage Systems and Their Impact on Soil Properties and Crop Yields

“…Although in some cases direct sowing on uncultivated land can reduce CO 2 emissions and help to conserve soil moisture, these effects are not the same at all stages of plant growth or under different environmental conditions, as in our study, where no-tillage was applied from the start of the experimental set-up, and the organic carbon stocks increased significantly. The studies of other researchers have also suggested that the widespread adoption of low-carbon farming practices could reverse the upward trend in land-use emissions, which could substantially offset global annual emissions as projected [55][56][57].…”