While natural source solid ocean pollution is a serious problem, there are several reasons that it is not the most alarming portion of ocean pollution. First, its incidence is believed to be relatively steady compared to soluble “runoff” pollutants and plastics, both of which have increased along with coastline population and the rise of industrialization in emerging markets. Many of the components of solid ocean pollution are either inert, for example dumped cement and steel, or readily biodegradable, like garbage, wood, construction supplies, and even steel. This form of pollution also has a lower secondary impact, or at least scientists and researchers understand the secondary impact better.