Oceanic Conveyor Belt; Credit: UNEP
Think island, think nature, think ocean, think tranquillity and think
pristine. Natural islands have always been escape destinations from the
concrete jungle chaos and
pollution.
Now think again, think unnatural islands, think strewn litter over the
ocean, which eventually accumulate as floating marine trash. Who would
have thought we could create whole human-made waste catastrophes in the
far-off ocean? Plastic discarded in America may be carried for many
kilometres over the oceans.
Oceanic Conveyor Belt
Like our atmospheric currents, our oceans function as conveyor belts.
The conveyor belt work done by the oceans regulates our climatic
control. This role has been diminished by human-induced
climate change,
this affects human, marine and land life-forms. Adding trash conveyance
to the equation, with extensive garbage being recklessly disposed of,
we are suffocating the oceans and inhibiting their role on the planet.
Trash Conveyance
The ocean currents move in certain patterns across the globe. Five grand
oceans,
the Atlantic, Pacific, Indian, Southern and Arctic, they keep the
planet cool yet warm enough for our existence and move with strength in
an eight-shaped pattern, mixing, blending and moving things along.
Atmospheric convection (unequal solar heating causing horizontal and
vertical flows) and the earth's rotation are the major forces working on
ocean movement producing belts of wind that dominant the planet. Two
main wind-forms over the ocean are the trade winds and westerly winds.
The friction caused over the ocean surface results in ocean currents.
Source: geography.com
The Earth's rotation (Coriolis Effect) and the presence of scattered
continental landmasses, create a secondary wind-induced surface
movement, the Gyre Currents. There are five main Gyres working either
westward, eastward, poleward or equatorwards.
Source: geography.com
Gyres
may be seen as the secondary current force but they substantial impacts
over coastal temperatures, currents and wind storms. In addition, gyres
result in the slow movement of water allowing the trash to collect. The
points of convergence are where the deposition of trash occurs and
eventually build up to form floating
trash islands.
Floating Waste Dumps
An area of concentration for waste over the ocean has been the '
Great Pacific Garbage Patch'
located between California and Hawaii. This patch arises from the North
Pacific Gyre. There other trash collection zones such as the Sargasso
Sea waste hotspot (in the Atlantic Ocean), the Western Pacific Garbage
Patch (off Japan's coastline) and the Indian Ocean Garbage Patch (only
discovered in 2010).
7 billion throw-away humans
We stand at a growing global population of 7 billion. Not only have
we overpopulated, but we have created a global society of waste
generators, unnecessary tonnage of fossil-fuel created plastic is
demanded in almost every product in our daily life, then we cast them
aside instead of reusing and recycling. Landfill sites are out of
capacity, land space for toxic dumps destroy wild-lands, vast quantities
of domestic garbage are disposed of along rivers, eventually finding
their way to the oceans and the obvious direct illegal disposals from
sea vessels.
Plastic Flotsam
Captain Charles Moore heading up a team of oceanic researchers
discovered that 90% of the floatsam in the Great Pacific Garbage Patch
is plastic. Plastic is a generic term referring to a range of human-made
petrochemical products. Plastic refers to bottled water containers,
caps on sodas drinks, plastic bags, bin-bags, take out containers, etc.
Plastics in general take a long time to degrade and therefore are
burden, but over land they degrade faster as opposed to in the ocean due
to temperature and algal growth on the plastic shielding solar rays.
However, plastics never fully degrade, they only become smaller
microplastics.
Threats to Marine Life
Plastic and other human generated solid waste are not only pollutants
based on their chemical composition but they are physical hazards to
wildlife. These hazards become evident when either ingested (choking
hazard) or physically debilitating a bird's movement. The consumed
pollutant also breaks down releasing
toxic PCBs
into the sea animal's body. In addition to plastic, fish nets also trap
marine life. Marine animals become entangled in the nets and this can
lead to injury, starvation and death. Marine life-forms also suffer from
life-long disabilities from ocean garbage, namely, plastic bands
fitting over baby
marine turtles that cause huge physiological deformity as the animal grows (see image below).
Source: Conservation Report, 2009
If we change our wasteful consumption, unnecessary production of new
plastic products, dumping waste, we may save innumerable lives, they may
not all be human, but we are responsible for them and all things living
on the planet.