Figure 1 : Mass of river plastic flowing into oceans in tonnes per year.

From: River plastic emissions to the world’s oceans

Figure 1

River contributions are derived from individual watershed characteristics such as population density (in inhab km−2), mismanaged plastic waste (MPW) production per country (in kg inhab−1 d−1) and monthly averaged runoff (in mm d−1). The model is calibrated against river plastic concentration measurements from Europe, Asia, North and South America.