Big storms or frequent rains can still flush millions of gallons of pollutants from land-based sources like treatment plants and storm sewers into the Atlantic.

Marine debris most commonly originates from land-based sources.

About 80 percent of marine debris comes from land-based sources.

Continuing availability of the key minerals from land-based sources at market prices.

That suggested a leak, perhaps from a land-based source that had not been identified.

The figure that an estimated 80% of the garbage comes from land-based sources and 20% from ships is derived from an unsubstantiated estimate.

Logically, the land-based sources of pollutants and plastics come from the great rivers from around the world.

At the same time, the Baltic Sea is also affected by pollution from land-based sources, hazardous substances and the effects of climate change.

Reefs in close proximity to human populations can be faced with local stresses, including poor water quality from land-based sources of pollution.

The biggest threats include "overfishing, destructive fishing practices, and sedimentation and pollution from land-based sources."