{"id":116763,"date":"2026-09-11T17:02:34","date_gmt":"2026-09-11T15:02:34","guid":{"rendered":"https:\/\/nilu.gnist.dev\/publikasjoner\/towards-net-zero-evaluating-combined-terrestrial-and-marine-cdr-approaches\/"},"modified":"2026-09-11T17:02:34","modified_gmt":"2026-09-11T15:02:34","slug":"towards-net-zero-evaluating-combined-terrestrial-and-marine-cdr-approaches","status":"publish","type":"nva_publication","link":"https:\/\/nilu.gnist.dev\/en\/publications\/towards-net-zero-evaluating-combined-terrestrial-and-marine-cdr-approaches\/","title":{"rendered":"Towards Net Zero: Evaluating Combined Terrestrial and Marine CDR Approaches"},"content":{"rendered":"<p class=\"wp-block-paragraph\">With the global annual mean temperature in 2024 exceeding 1.5\u00b0C above preindustrial levels, there is an urgent need to investigate pathways for returning the Earth system to lower temperature levels. In addition to stringent emission reduction, we need portfolios of Carbon Dioxide Removal (CDR) techniques to achieve the net-zero emission target. Therefore, it is crucial to evaluate various land and ocean-based CDRs for their effectiveness, environmental risks, and additional benefits.<br \/>\nThis study evaluates the CO\u2082 sequestration potential and efficacy of two prominent CDR methods\u2014Bioenergy with Carbon Capture and Storage (BECCS) and Ocean Alkalinity Enhancement (OAE)\u2014applied both individually and in combination. Using the Norwegian Earth System Model (NorESM2-LM), simulations were designed with ramped-up CDR deployment, targeting 5.2 million km\u00b2 of bioenergy feedstock for BECCS and a CaO deployment rate of 2.7 Gt\/year for OAE by 2100 across the exclusive economic zones of Europe, the United States, and China. The results reveal a nearly additive carbon removal effect of BECCS and OAE. Over the period 2030-2100, OAE sequestered a total of 7 ppm of CO2 with an accumulated 82.3 Gt CaO, achieving a CDR effectiveness of 0.08 ppm per Gt of CaO, while BECCS removes 23 ppm of CO2, with CDR effectiveness of 3.1 ppm per million km\u00b2 of bioenergy crops.  The combined BECCS-OAE simulation offsets anthropogenic CO\u2082 emissions of 5.4 Gt\/year by 2100\u2014equivalent to over 60% of current global transport sector emissions. However, the combined CDR scenario shows negligible effects on the global annual mean temperature, with no clear response detectable against the high internal variability. This underscores the limitations of current CDR approaches in addressing climate warming over the 21st century and emphasizes the need for substantial emissions reductions, supportive policies and diversified CDR strategies to facilitate a return to lower global temperatures.<\/p>\n","protected":false},"template":"","meta":{"_acf_changed":false,"_searchwp_excluded":"","_id":"","_status":"PUBLISHED","_sync_date":"2026-09-11 14:13:45","footnotes":""},"nva_tax_category":[1085],"class_list":["post-116763","nva_publication","type-nva_publication","status-publish","hentry","nva_tax_category-lecture"],"acf":[],"_links":{"self":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication\/116763","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication"}],"about":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/types\/nva_publication"}],"version-history":[{"count":0,"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication\/116763\/revisions"}],"wp:attachment":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/media?parent=116763"}],"wp:term":[{"taxonomy":"nva_tax_category","embeddable":true,"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_tax_category?post=116763"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}