Plastic shopping bags are widely used for
transporting a range of small consumer goods and in some regions, also serve
secondary roles for conveying drinking water and disposing of human
and other domestic wastes. While annual production and use statistics are not
available from industry sectors, environmental groups estimate that between 500
billion and 1 trillion plastic bags are used globally each year. Since their
inception, uncontrolled disposal of these bags has been causing environmental
problems worldwide, and many municipal, regional, and national governments are
beginning to take action.
The problem is particularly acute in Africa due
to its unique set of socio-economic and political conditions. Similarly unique
solutions will be needed to solve this complex issue. In a number of African
countries including Nigeria, plastic bag pollution is causing severe
environmental and health damage that manifests itself in a number of ways. The
bags are also used for disposing of human waste in city streets, in gutters,
and on neighboring roofs. This leads to an "out-of-sight,
out-of-mind" philosophy that superficially and incorrectly portrays the
absence of the existing health risks compared to otherwise "open"
human waste disposal.
Bags can block storm drains and sewage systems,
leading to flooding and increased spread of disease. Water trapped in the bags
also provides an ideal breeding ground for mosquitoes, raising the risk of
malaria transmission. Plastic bags in our sewage system breed death threatening
pathogens like typhoid, cholera, bacillary dysentery, tuberculosis, anthrax
ophthalmia and infantile diarrhea, as well as parasitic worms.
Since most landfills are not routinely covered
with soil in Nigeria, the bags are easily transported around the countryside
where wildlife and livestock consume the materials, thus entering the food
chain. The open fifth caused by plastic bags in our environmental promote excess
reproduction of the house fly; more than 100 pathogens associated with the
house fly may cause disease in humans and livestock.
Another health damaging practice is burning of waste. Where the bags are burned either for energy or mass reduction purposes, heavy metals and toxic organic compounds (e.g., polychlorinated dibenzo-p-dioxins and furans [PCDD/Fs; commonly referred to as "dioxins"] and polyaromatic hydrocarbons [PAHs]) can be produced causing respiratory diseases like asthma, cystic fibrosis, emphysema, chronic obstructive pulmonary disorder or acute respiratory distress syndrome just to name a few.
In agricultural areas, the bags can interfere
with water and air movement through the soils, and thus decrease productivity
of much-needed farmlands. And perhaps of greatest consequence, regardless of
their location or end use, the bags require unsustainable petroleum-based raw
material inputs for their production and once produced require centuries or
millennia to decompose.
We need to eliminate the
dependency on single-use plastic bag in our everyday habits…