Could soil microplastic pollution exacerbate climate change? A meta-analysis of greenhouse gas emissions and global warming potential

文献类型： 外文期刊

第一作者： Iqbal, Shahid

作者： Iqbal, Shahid;Xu, Jianchu;Gui, Heng;Iqbal, Shahid;Xu, Jianchu;Gui, Heng;Xu, Jianchu;Arif, Muhammad Saleem;Shakoor, Awais;Shakoor, Awais;Shakoor, Awais;Worthy, Fiona R.;Khan, Sehroon;Nader, Sadia;Bu, Dengpan;Bu, Dengpan;Bu, Dengpan;Ranjitkar, Sailesh;Ranjitkar, Sailesh;Ranjitkar, Sailesh

作者机构：

关键词： Pakistan; Carbon dioxide; Climate warming; Methane; Nitrous oxide; Plastic residues; Soil pollution

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：8.3； 五年影响因子：8.2 ）

ISSN： 0013-9351

年卷期： 2024 年 252 卷

页码：

收录情况： SCI

摘要： Microplastics pollution and climate change are primarily investigated in isolation, despite their joint threat to the environment. Greenhouse gases (GHGs) are emitted during: the production of plastic and rubber, the use and degradation of plastic, and after contamination of environment. This is the first meta-analysis to assess underlying causal relationships and the influence of likely mediators. We included 60 peer-reviewed empirical studies; estimating GHGs emissions effect size and global warming potential (GWP), according to key microplastics properties and soil conditions. We investigated interrelationships with microbe functional gene expression. Overall, microplastics contamination was associated with increased GHGs emissions, with the strongest effect (60%) on CH4 emissions. Polylactic-acid caused 32% higher CO2 emissions, but only 1% of total GWP. Phenolformaldehyde had the greatest (175%) GWP via 182% increased N2O emissions. Only polystyrene resulted in reduced GWP by 50%, due to N2O mitigation. Polyethylene caused the maximum (60%) CH4 emissions. Shapes of microplastics differed in GWP: fiber had the greatest GWP (66%) whereas beads reduced GWP by 53%. Films substantially increased emissions of all GHGs: 14% CO2, 10% N2O and 60% CH4. Larger-sized microplastics had higher GWP (125%) due to their 9% CO2 and 63% N2O emissions. GWP rose sharply if soil microplastics content exceeded 0.5%. Higher CO2 emissions, ranging from 4% to 20%, arose from soil which was either fine, saturated or had high-carbon content. Higher N2O emissions, ranging from 10% to 95%, arose from soils that had either medium texture, saturated water content or low-carbon content. Both CO2 and N2O emissions were 43%-56% higher from soils with neutral pH. We conclude that microplastics contamination can cause raised GHGs emissions, posing a risk of exacerbating climate-change. We show clear links between GHGs emissions, microplastics underlying mechanisms and processes.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序