Marine circulation and weather conditions greatly affect microplastic aggregation and movement. Microplastics, which are particles measuring less than 5 mm, are of increasing concern. They not only become more relevant as other plastic marine litter breaks down into tiny particles, they also interact with species in a range of marine habitats. A study by Natalie Welden and Amy Lusher published in Integrated Environmental Assessment and Management, takes a look at how global climate change and the impact of changing ocean circulation affects the distribution of marine microplastic litter. It is part of a special invited section on microplastics.