Microplastic research publications from 1991 to 2020 -- Characterization and toxicology of microplastics in soils, water and air -- Coral feeding behavior on microplastics -- Microplastics remediation in the aqueous environment -- Removal of environmental microplastics by advanced oxidation processes -- Techniques for removal and degradation of microplastics -- Occurrence and removal of microplastics in wastewater treatment plants -- Microplastic souces, transport, exposure, analysis and removal -- Airborne microplastics in outdoor and indoor environments -- Nanoplastic sources, characterization, ecological impact, remediation and policies -- Microplastics in soil-plant systems.