A growing threat to the ocean and coasts, marine pollution comes in many forms and from many sources. We have made meaningful steps towards improving our understanding of this multifaceted issue, allowing us to better meet the task of cleaning the ocean. The more we understand, the more it feels like a tremendous challenge. But there is a silver lining to our uncovering the scale and depth of marine pollution. Now we know, we can fix it.  In partnership with Mission Blue, this solution-focused edition reports on the global efforts to tackle marine litter and plastic waste, nutrients and harmful algal blooms, ocean noise, chemicals and pesticides, and oil spills.