{"query_echo":{"q":"","filters":{"analysis_type":["GHG emissions re-estimation"]},"warnings":[{"code":"facet_value_not_in_vocabulary","message":"Value 'GHG emissions re-estimation' for facet 'analysis_type' is not in the controlled vocabulary."}]},"total":{"value":1,"relation":"eq"},"page":1,"page_size":20,"self":"https://climateinsightsdirectory.org/api/v1/search?analysis_type=GHG+emissions+re-estimation","stability":"beta","ai_marking":{"digital_source_type":{"uri":"http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia","name":"Created using Generative AI"},"notice":"Summary and key insights are generated using artificial intelligence."},"results":[{"id":"wri-001677","url":"https://climateinsightsdirectory.org/document/wri-001677","title":"Analysis of US manure management and recommendations to mitigate associated greenhouse gas emissions","publisher":{"name":"World Resources Institute","organization":"world-resources-institute"},"document_type":"research paper","language":"en","date_published":"2025-08","source_url":"https://files.wri.org/d8/s3fs-public/2025-08/analysis-and-recommendations-to-mitigate-greenhouse-gas-emissions-from-u.s-manure-management.pdf?VersionId=Pnibe1aHhImLtRl0WdkdrFz.N3Ci.gYa","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The report argues that US manure management emissions, particularly from dairy and swine farms, are likely 40% higher than EPA estimates due to the consolidation of livestock into larger farms using wet storage systems. While anaerobic digesters are the most common mitigation tool, the authors find them expensive and less effective than often claimed. Instead, the paper identifies solid-liquid separation, acidification, aeration, and cover-and-flare systems as more cost-effective alternatives, though these require further large-scale piloting and financial support to achieve widespread adoption.","ai_generated":true,"unit":"wri-001677#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"The authors estimate that 2022 greenhouse gas emissions from dairy and swine manure management are approximately 40% higher than the US Environmental Protection Agency (EPA) estimates, which suggests manure management accounts for at least 1.6% of total US gross GHG emissions.","ai_generated":true,"unit":"wri-001677#insight-1","date_modified":"2026-10-23"},{"text":"The underestimation of emissions is attributed to the EPA's failure to adequately adjust for the consolidation of livestock into larger farms that rely on wet storage systems, such as anaerobic lagoons, slurry tanks, and deep pits.","ai_generated":true,"unit":"wri-001677#insight-2","date_modified":"2026-10-23"},{"text":"Anaerobic digesters are identified as the most expensive mitigation option, with high infrastructure costs and limited effectiveness; for 'manure only' digesters, methane reductions are likely 25% or less when the baseline is a lagoon.","ai_generated":true,"unit":"wri-001677#insight-3","date_modified":"2026-10-23"},{"text":"Cover-and-flare systems are presented as a more affordable and scalable alternative to anaerobic digesters, with the potential to reduce GHG emissions by 62% to 100% in cattle and swine farms.","ai_generated":true,"unit":"wri-001677#insight-4","date_modified":"2026-10-23"},{"text":"Solid-liquid separation can reduce methane emissions by removing volatile solids from manure; for dairy operations, mitigation costs for these technologies range from $3.3 to $24 per tonne of CO2e, while for swine they range from $3.7 to $28 per tonne of CO2e.","ai_generated":true,"unit":"wri-001677#insight-5","date_modified":"2026-10-23"},{"text":"Acidification, which involves lowering the pH of manure to inhibit methanogens, can be highly effective; low-dose acidification using a third-party service is estimated to cost $6.2 per tonne of CO2e for dairy and $21 per tonne of CO2e for swine.","ai_generated":true,"unit":"wri-001677#insight-6","date_modified":"2026-10-23"},{"text":"Aeration systems prevent methane formation by maintaining aerobic conditions in storage; for dairy, costs are estimated at $16 to $35 per tonne of CO2e for a 40-57% methane reduction, while swine costs are significantly higher, ranging from $42 to $188 per tonne of CO2e.","ai_generated":true,"unit":"wri-001677#insight-7","date_modified":"2026-10-23"},{"text":"Increasing the frequency of manure removal from animal housing to outside storage can significantly reduce barn methane emissions; one study found reductions of 18-41% in summer and 53-83% in winter for swine slurry removed weekly or more.","ai_generated":true,"unit":"wri-001677#insight-8","date_modified":"2026-10-23"}],"climate_tags":["methane emissions","biogas","kilogram of carbon dioxide equivalent"],"geography_discussed":["California","Iowa","North Carolina","Europe"],"frame_perspective":[],"analysis_type":["GHG emissions re-estimation","mitigation technology assessment","cost-benefit analysis"]}]}