Plastic pollution is ubiquitous in terrestrial and aquatic ecosystems. Plastic waste exposed to the environment creates problems and is of significant concern for all life forms. Plastic production and accumulation in the natural environment are occurring at an unprecedented rate due to indiscriminate use, inadequate recycling, and deposits in landfills. In 2019, the global production of plastic was at 370 million tons, with only 9% of it being recycled, 12% being incinerated, and the remaining left in the environment or landfills. The leakage of plastic wastes into terrestrial and aquatic ecosystems is occurring at an unprecedented rate. The management of plastic waste is a challenging problem for researchers, policymakers, citizens, and other stakeholders. Therefore, here, we summarize the current understanding and concerns of plastics pollution (microplastics or nanoplastics) on natural ecosystems. The overall goal of this review is to provide background assessment on the adverse effects of plastic pollution on natural ecosystems; interlink the management of plastic pollution with sustainable development goals; address the policy initiatives under transdisciplinary approaches through life cycle assessment, circular economy, and sustainability; identify the knowledge gaps; and provide current policy recommendations. Plastic waste management through community involvement and socio-economic inputs in different countries are presented and discussed. Plastic ban policies and public awareness are likely the major mitigation interventions. The need for life cycle assessment and circularity to assess the potential environmental impacts and resources used throughout a plastic product’s life span is emphasized. Innovations are needed to reduce, reuse, recycle, and recover plastics and find eco-friendly replacements for plastics. Empowering and educating communities and citizens to act collectively to minimize plastic pollution and use alternative options for plastics must be promoted and enforced. Plastic pollution is a global concern that must be addressed collectively with the utmost priority.

Microplastic disposal into riverine ecosystems is an emergent ecological hazard that mainly originated from land-based sources. This paper presents a comprehensive review on physical processes involved in microplastics transport in riverine ecosystems. Microplastic transport is governed by physical characteristics (e.g., plastic particle density, shape, and size) and hydrodynamics (e.g., laminar and turbulent flow conditions). High-density microplastics are likely to prevail near riverbeds, whereas low-density particles float over river surfaces. Microplastic transport occurs either due to gravity-driven (vertical transport) or settling (horizontal transport) in river ecosystems. Microplastics are subjected to various natural phenomena such as suspension, deposition, detachment, resuspension, and translocation during transport processes. Limited information is available on settling and rising velocities for various polymeric plastic particles. Therefore, this paper highlights how appropriately empirical transport models explain vertical and horizontal distribution of microplastic in riverine ecosystems. Microplastics interact, and thus feedback loops within the environment govern their fate, particularly as these ecosystems are under increasing biodiversity loss and climate change threat. This review provides outlines for fate and transport of microplastics in riverine ecosystems, which will help scientists, policymakers, and stakeholders in better monitoring and mitigating microplastics pollution.

In India in recent decades, groundwater has emerged as a principal source for meeting drinking and irrigation needs. As a result, groundwater depletion and overextraction are acknowledged as a major concern. Different policy interventions are being explored to augment the management of aquifers. Aquifer storage and recovery (ASR) is one such intervention that is becoming popular among government agencies, developmental actors, and even farmers for recharging and recovering water from aquifers. However, the selection of a suitable location and appropriate aquifer for recharge is challenging. The main objective of this study was to classify site selection criteria for ASR installations in different types of aquifers in North India. In this study, both scientific indicators (i.e., rainfall, elevation, soil and aquifer characteristics, surface and groundwater quality) and social characteristics (tacit knowledge, land ownership, willingness to participate) were evaluated to create an integrated ASR site selection criterion. The results indicated that ASR sites could not be appropriately identified solely based on available metrological, geospatial, and geohydrological data. Socioeconomic parameters should be an integral part of the decision-making process for the site selection for ASR. Based on these scientific indicators and social characteristics, a total of seven potential ASR sites (three in the village of Nekpur and four in the village of Meyar) were selected at Rajgir, Nalanda, Bihar, India. Although this integrated site-assessment framework was designed based on 12 indicators in the context of the marginal alluvial plains for the mid-Ganga regions in this study, the general principles adopted in this study can be applicable to other regions.