Every year, the sum of humanity’s knowledge increases exponentially. And as we learn more, we also learn there is much we still don’t know. Plastic litter in our oceans is one area where we need to learn more, and we need to learn it quickly but we already know enough to take action. It sounds like a contradiction, but it’s not. As the Marine Litter Vital Graphics report explains, we need to act now if we want to avoid living in a sea of plastic by mid-century – even if we don’t know everything about what it’s doing to the health of people or the environment.