8. Great Pacific Garbage Patch
Although its size is unknown, the Great Pacific Garbage Patch is believed to be largest landfill on Earth. It is impossible to detect the patch by satellite or aircraft because most of the debris is very small and suspended just below the surface. By some estimates, the patch may occupy 8 percent of the Pacific Ocean or 15 million square kilometers, which is twice the size of US mainland. The “plastic soup” is created from vortex and multiple current convergences that collect floating waste from along the Pacific shorelines.
Over the decades, the plastic debris may disintegrate into molecular level and contaminate plankton as well as small fishes, which can go all the way up to the top of food chain, human.