Metal-containing plant incineration ash (MPIA), which was the by-product for metal extraction from soil by phytoextraction process, contains various kinds of heavy metal that have post potential risk to the environment. This study investigated the leaching efficiency and metal redistribution of MPIA using organic acid as leaching agents. The MPIA before and after leaching was characterized using the toxicity characteristic leaching procedure (TCPL) test, X-ray diffraction, scanning electronic microscopy, and Fourier transform infrared spectroscopy. The results showed that all tested organic acids resulted in the dissolution of metals, especially 1 mol L-1 citric acid leaching achieved for the dissolution efficiency of 84% Mn, 87.01% Cd, 66.97% Zn, and 55.83% Pb. During leaching progress, the synergetic of chelation and acid soluble action accelerated the metal release and redistribution, and the dissolution of Mn, Zn, Pb, and Cd fit best to the shrinking core model of chemical control. Meanwhile, the leaching residue reached the regulatory standard. Thus, organic acid leaching may be a feasible strategy for detoxification of MPIA.Eco-tourism has become increasingly popular in the postmodern era. However, the management of tourism waste remains a major challenge for tourist destinations worldwide. Here, a non-participatory survey was conducted in five famous scenic spots in Yarlung Zangbo Grand Canyon National Park in Motuo County, Tibet, to characterize the waste composition and the amount of average daily production per capita during sightseeing. In addition, interviews were conducted at 26 restaurants and 32 hotels in Motuo Town (the administrative center of Motuo County), and data on the composition and amount of average daily production per capita of waste generated by tourists during accommodation and meals were obtained. The total amount of tourism waste in Motuo County in 2018 was approximately 172,108.82 kg. Based on the data collected, an emergy analysis was applied to emergy calculations of the pollution and losses generated during two conventional and locally used tourism waste disposal methods. According to China’s emergy to money ratio (EMR) of 2018, the emergy was converted into its monetary value. The theoretical ecological compensation standard for Motuo County was 4,293,568.99 CNY (equivalent to 648,830.20 USD), and the average ticket price for a single tourist was 18.87 CNY (equivalent to 2.85 USD) in the absence of government fiscal transfer payments. These findings should be utilized by local national park authorities to establish a market-oriented ecological compensation mechanism that is capable of alleviating environmental pressure.Underground coal fires are considered an ecological disaster. While underground coal fires are prevalent in coal-producing areas throughout the world, they are most problematic in northern China. Previous studies have shown that underground coal fires stimulate the formation of cracks or gas outlets on the surface, as well as coal fire sponges (CFS) on the soil layer surface, which collect coal-fired pollutants. Herein, ultra-high-performance liquid chromatography (UHPLC) was used in conjunction with electrospray ionization (ESI) high-resolution mass spectrometry to analyze CFS samples collected from the No. 8 fire zone, located in Wuda coalfield, Inner Mongolia, China. The results show that CFS contain 233 oxy-substituted polycyclic aromatic hydrocarbons (O-PAHs), e.g., naphthaldehyde; 40 oxapolycyclic aromatic hydrocarbons (OPAHs), e.g., dibenzofuran; 40 alkyl-substituted polycyclic aromatic hydrocarbons (R-PAHs); and 11 parent polycyclic aromatic hydrocarbons (PPAHs). Thus, CFS are primarily composed of O-PAHs, which are 25 times and 5 times more prevalent than PPAHs and R-PAHs, respectively. As such, a high relative abundance of varied O-PAHs are discharged from underground coal fires, which is significantly different from what is released during industrial coal burning. Owing to their water solubility and condensability, the new facts disclosed in this paper may provide a new perspective for understanding complex organic pollutants from underground coal fires and their environmental impacts.Diet is the main way for the human body to ingest polycyclic aromatic hydrocarbons (PAHs). In this study, the occurrence, dietary exposure, and health risks of 15 PAHs in 31 fried and grilled fish samples were investigated, which were collected from the Shandong Province of China. The results showed that benzo[a]pyrene (BaP) of 5 samples exceeded the European Union (EU) limit value. Naphthalene (NaP) and fluorene (Fle) were present in all samples, and the average concentration of ∑15PAHs was 91.1 μg/kg, with light PAHs dominated. The average contamination level of ∑15PAHs in fried and grilled fish was distributed differently, and there seemed to be more PAH contamination in the grilled samples. The results of the margin of exposure (MOE) suggested that PAH ingestion through fried and grilled fish did not imply significant toxicological concern for consumers in Shandong. learn more The incremental lifetime cancer risk (ILCR) values for the consumption of fried and grilled fish were higher than 1 × 10-6, indicating a potential health risk in the adult population. The study provides baseline health information on PAH intake by residents due to dietary exposure to fried and grilled fish food products, suggesting that health risk monitoring of PAHs in such foods should be continually performed.Most of the extant literature on the environmental impact of tourism has ignored the possible spatial interaction effects across countries. This study thus aims to re-investigate the impact of tourism development on CO2 emissions by taking spatial dependence into account. To that end, the spatial econometric techniques, which can address the issue of potential spatial dependence among countries, are adopted. Using a panel data of 95 countries over 2000-2014, the results confirm that there exists a significant spatial dependence among national CO2 emissions. Besides, the results provide confirmation that tourism development exerts a significant enhancing influence on CO2 emissions. Interestingly, we find that the promoting effect of tourism development on CO2 emissions primarily comes from the spillover effect rather than the direct effect, after considering spatial dependence. Finally, in light of the research findings, some policy implications are put forward to improve environmental quality.