{"query_echo":{"q":"","filters":{"analysis_type":["model assessment"]},"warnings":[{"code":"facet_value_not_in_vocabulary","message":"Value 'model assessment' for facet 'analysis_type' is not in the controlled vocabulary."}]},"total":{"value":2,"relation":"eq"},"page":1,"page_size":20,"self":"https://climateinsightsdirectory.org/api/v1/search?analysis_type=model+assessment","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":"newclim-000200","url":"https://climateinsightsdirectory.org/document/newclim-000200","title":"Future role for voluntary carbon markets in the Paris era","publisher":{"name":"NewClimate Institute","organization":"newclimate-institute"},"document_type":"report","language":"en","date_published":"2020-11-24","source_url":"http://www.newclimate.org/resources/publications/future-role-for-voluntary-carbon-markets-in-the-paris-era","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The report examines the transition of voluntary carbon markets into the Paris Agreement era, specifically assessing how to prevent 'double counting' where emission reductions are claimed by both voluntary offsets and national targets. It identifies three potentially viable models—contribution claims, NDC crediting, and non-NDC crediting—and recommends focusing on challenging mitigation options and countries with ambitious Nationally Determined Contributions (NDCs) to maximize climate impact.","ai_generated":true,"unit":"newclim-000200#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"The risk of 'double counting'—where the same emission reduction is used for both voluntary offsetting and a country's Paris Agreement target—could result in the voluntary carbon market having a negligible or even negative overall impact on the climate.","ai_generated":true,"unit":"newclim-000200#insight-1","date_modified":"2026-10-23"},{"text":"The analysis identifies three potentially viable models for voluntary carbon markets in the Paris era: 'contribution claim', 'NDC crediting', and 'non-NDC crediting', noting that their relative attractiveness may shift as countries increase the scale of their NDCs.","ai_generated":true,"unit":"newclim-000200#insight-2","date_modified":"2026-10-23"},{"text":"To maximize climate impact and mitigate risks, the report recommends that voluntary markets prioritize project activities that represent challenging mitigation options and target host countries that have ambitious NDC targets.","ai_generated":true,"unit":"newclim-000200#insight-3","date_modified":"2026-10-23"}],"climate_tags":["Paris Agreement","greenhouse gas emissions reduction","Nationally Determined Contributions","climate change mitigation"],"geography_discussed":["Germany"],"frame_perspective":[],"analysis_type":["policy analysis","model assessment"]},{"id":"catf-000494","url":"https://climateinsightsdirectory.org/document/catf-000494","title":"Estimating Indirect Land Use Change Emissions from Biofuels","publisher":{"name":"Clean Air Task Force","organization":"clean-air-task-force"},"document_type":"statement","language":"en","date_published":"2014-05-19","source_url":"https://cdn.catf.us/wp-content/uploads/2017/10/21093225/20140519-CATF-Comments-on-ARB-Proposed-ILUC-Analysis.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The Clean Air Task Force (CATF) submitted comments to the California Air Resources Board (ARB) arguing against reducing indirect land use change (ILUC) emissions estimates for biofuels. CATF contends that the GTAP model used by ARB undercounts emissions by ignoring water scarcity constraints, failing to distinguish between commercial and non-commercial forests, and using flawed yield improvement assumptions. Specifically, CATF cites research showing that accounting for irrigation constraints can increase land-based emissions by 27.5%. The document also highlights that climate-driven drought in the US Midwest may decelerate corn yields and that the current framework ignores nitrous oxide emissions from increased fertilizer use required to sustain yield growth.","ai_generated":true,"unit":"catf-000494#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"The GTAP model likely underestimates ILUC emissions because it ignores water scarcity constraints. Research by Taheripour et al. (2013) indicates that when physical limitations on irrigation expansion are factored in, land-based emissions from US ethanol production increase from 35.6 g CO2e/MJ to 45.4 g CO2e/MJ, representing a 27.5% increase.","ai_generated":true,"unit":"catf-000494#insight-1","date_modified":"2026-10-23"},{"text":"GTAP's failure to differentiate between commercial and non-commercial forests artificially suppresses ILUC estimates. The model assumes all forestland is commercially managed, which exaggerates economic limits on conversion and fails to recognize that converting non-commercial forestland would not trigger the same afforestation response as commercial land.","ai_generated":true,"unit":"catf-000494#insight-2","date_modified":"2026-10-23"},{"text":"The use of a single yield price elasticity value for all crops and regions in GTAP is problematic. CATF argues that the high elasticity values observed for corn in the US Midwest are not representative of other crops or regions, such as rice in developing areas, and using them as a proxy likely lowers ILUC estimates.","ai_generated":true,"unit":"catf-000494#insight-3","date_modified":"2026-10-23"},{"text":"Recent research suggests that future corn yields in the US Midwest may decelerate due to climate change. A 2014 study by Lobell et al. found that increased daytime vapor pressure deficit (VPD) caused by hotter and drier Julys could reduce yields by 15% to 30% over the next 50 years.","ai_generated":true,"unit":"catf-000494#insight-4","date_modified":"2026-10-23"},{"text":"The ARB modeling framework undercounts greenhouse gas emissions by failing to account for the nitrous oxide (N2O) produced by increased fertilizer use. While the model counts the benefits of price-induced yield increases, it ignores the climate cost of the nitrogen-based fertilizers required to achieve those yields.","ai_generated":true,"unit":"catf-000494#insight-5","date_modified":"2026-10-23"},{"text":"The implementation of regionalized marginal crop yield estimates in GTAP introduces significant uncertainty. The current method uses 1996 corn data from Iowa as a proxy for all crops globally and assumes net primary productivity (NPP) is a reliable proxy for yield.","ai_generated":true,"unit":"catf-000494#insight-6","date_modified":"2026-10-23"}],"climate_tags":["biofuel","greenhouse gas emissions","emission intensity","water scarcity","agricultural irrigation","deforestation","crop yield","nitrous oxide","climate change"],"geography_discussed":["United States"],"frame_perspective":[],"analysis_type":["policy critique","model assessment"]}]}