While the use of exhaust “scrubbers” on seabound vessels may be benefiting air quality, it now seems that this trend is coming at the expense of the world’s source water. “The toxins do not just disappear,” The Guardian reported. “Aside from being acidic, scrubbers contain heavy metals that accumulate in marine food chains… What most concerns experts, though, are polycyclic aromatic hydrocarbons (PAHs). These have been linked to several types of cancers and reproductive dysfunction in marine animals.”