Mitigating methane(CH_(4))emissions from China’s coal mines as the largest contributor to anthropogenic CH_(4)emissions is vital for limiting global warming.However,the knowledge about CH_(4)mitigation potentials and...Mitigating methane(CH_(4))emissions from China’s coal mines as the largest contributor to anthropogenic CH_(4)emissions is vital for limiting global warming.However,the knowledge about CH_(4)mitigation potentials and economic costs of Chinese coal mines remain poorly understood,which hinders the formulation of tailored CH_(4)mitigation strategies.Here,we estimate and project China’s provincial coal mine methane(CMM)emissions,mitigation potentials and costs under various coal production scenarios,by integrating the dynamic emission factors of CMM and key abatement technologies.We find that through continuous coal cuts and available CMM mitigation measures,China’s CMM emissions can be reduced by 65%-78%(10.9 Tg-13.1 Tg)in 2060,compared with the 2021 level.CH_(4)emissions from abandoned coal mines will far exceed those from coal mining under the 2060 carbon-neutral scenario,especially in northeastern China.It was also found that CMM mitigation is not economically feasible at present,but may be the most cost-effective solution as CO_(2)prices increase.All coalproducing provinces can achieve CMM mitigation below 50 RMB/t CO_(2)e in 2060.Inner Mongolia is identified as a hotspot for CMM mitigation with huge potential and lower cost.Our prospective assessment can provide insights into China’s CMM mitigation in response to climate change.展开更多
Achieving net-zero CO_(2)emissions is the current main focus of China’s carbon neutrality goal.However,non-CO_(2)greenhouse gases(GHGs)are more powerful climate forcers,making their emission reduction an opportunity ...Achieving net-zero CO_(2)emissions is the current main focus of China’s carbon neutrality goal.However,non-CO_(2)greenhouse gases(GHGs)are more powerful climate forcers,making their emission reduction an opportunity to rapidly mitigate future warming.Here,we evaluate non-CO_(2)mitigation potentials,costs and climate benefits in the context of China’s carbon neutrality goals.The assessment is conducted by coupling the integrated assessment model GCAM with a climate emulator.The findings indicate that mitigation technologies can largely reduce fluorinated gas emissions from industrial sectors,but long-term non-CO_(2)reductions of energy sector activities rely heavily on fuel switching.Furthermore,the cumulative costs of deploying non-CO_(2)mitigation technologies are projected to be less than 10%of the total costs of achieving carbon neutrality from 2020 to 2060.If non-CO_(2)mitigation measures are included in the overall mitigation portfolio,the benefits of avoided warming would by far outweigh the total mitigation cost increase.Our results thus highlight that incorporating a wider suite of GHGs into climate change mitigation strategies can enhance the cost-effectiveness of mitigation efforts.展开更多
基金supported by grants from the National Natural Science Foundation of China(72074138,72303136)Shandong Provincial Natural Science Foundation(ZR2021YQ27,ZR2023QG002)+1 种基金the National Social Science Fund of China(22VMG017)Postdoctoral Science Foundation of Shandong Province(SDCX-RS-202202002).
文摘Mitigating methane(CH_(4))emissions from China’s coal mines as the largest contributor to anthropogenic CH_(4)emissions is vital for limiting global warming.However,the knowledge about CH_(4)mitigation potentials and economic costs of Chinese coal mines remain poorly understood,which hinders the formulation of tailored CH_(4)mitigation strategies.Here,we estimate and project China’s provincial coal mine methane(CMM)emissions,mitigation potentials and costs under various coal production scenarios,by integrating the dynamic emission factors of CMM and key abatement technologies.We find that through continuous coal cuts and available CMM mitigation measures,China’s CMM emissions can be reduced by 65%-78%(10.9 Tg-13.1 Tg)in 2060,compared with the 2021 level.CH_(4)emissions from abandoned coal mines will far exceed those from coal mining under the 2060 carbon-neutral scenario,especially in northeastern China.It was also found that CMM mitigation is not economically feasible at present,but may be the most cost-effective solution as CO_(2)prices increase.All coalproducing provinces can achieve CMM mitigation below 50 RMB/t CO_(2)e in 2060.Inner Mongolia is identified as a hotspot for CMM mitigation with huge potential and lower cost.Our prospective assessment can provide insights into China’s CMM mitigation in response to climate change.
基金supported by the National Key Research and Development Program of China(2022YFC3105304)the National Natural Science Foundation of China(72303136)+1 种基金the Shandong Natural Science Foundation of China(ZR2023QG002)Major grant in National Social Sciences of China(23VRC037,24VHQ018).
文摘Achieving net-zero CO_(2)emissions is the current main focus of China’s carbon neutrality goal.However,non-CO_(2)greenhouse gases(GHGs)are more powerful climate forcers,making their emission reduction an opportunity to rapidly mitigate future warming.Here,we evaluate non-CO_(2)mitigation potentials,costs and climate benefits in the context of China’s carbon neutrality goals.The assessment is conducted by coupling the integrated assessment model GCAM with a climate emulator.The findings indicate that mitigation technologies can largely reduce fluorinated gas emissions from industrial sectors,but long-term non-CO_(2)reductions of energy sector activities rely heavily on fuel switching.Furthermore,the cumulative costs of deploying non-CO_(2)mitigation technologies are projected to be less than 10%of the total costs of achieving carbon neutrality from 2020 to 2060.If non-CO_(2)mitigation measures are included in the overall mitigation portfolio,the benefits of avoided warming would by far outweigh the total mitigation cost increase.Our results thus highlight that incorporating a wider suite of GHGs into climate change mitigation strategies can enhance the cost-effectiveness of mitigation efforts.
