CHAPTER ONE

INTRODUCTION

1.1 Background of the study

Marine pollution occurs when harmful, or potentially harmful, effects result from the entry into the ocean of chemicals, particles, industrial, agricultural and residential waste, noise, or the spread of invasive organisms. Eighty percent of marine pollution comes from land. Air pollution is also a contributing factor by carrying off pesticides or dirt into the ocean. Land and air pollution have proven to be harmful to marine life and its habitats.

The pollution often comes from non point sources such as agricultural runoff, wind-blown debris and dust. Nutrient pollution, a form of water pollution, refers to contamination by excessive inputs of nutrients. It is a primary cause of eutrophication of surface waters, in which excess nutrients, usually nitrogen or phosphorus, stimulate algae growth.

Many potentially toxic chemicals adhere to tiny particles which are then taken up by plankton and benthos animals, most of which are either deposit or filter feeders. In this way, the toxins are concentrated upward within ocean food chains. Many particles combine chemically in a manner highly depletive of oxygen, causing estuaries to become anoxic.

When pesticides are incorporated into the marine ecosystem, they quickly become absorbed into marine food webs. Once in the food webs, these pesticides can cause mutations, as well as diseases, which can be harmful to humans as well as the entire food web.

Toxic metals can also be introduced into marine food webs. These can cause a change to tissue matter, biochemistry, behaviour, reproduction, and suppress growth in marine life. Also, many animal feeds have a high fish meal or fish hydrolysate content. In this way, marine toxins can be transferred to land animals, and appear later in meat and dairy products.

Around 90% of world trading is carried out by the shipping industry. Shipping is well thought-out as a safe, economical, and environmental form of commercial transport. Although increasing cases draws public attention to marine pollution, the statistics show a slow but steady decline in maritime pollution over the past 10 years. This decade follows the general shipping safety improvement trend that took place over the 20th century. Records showed a rate of loss of 1% a year in 1910; this rate has improved to the figure of about one ship in every 670 in 2010. Shipping is also a highly regulated domain, and regulations have been reinforced in the last two decades.

Marine pollution have potentially harmful effects on the health and livelihood of nearby communities, e.g like gas flaring as they release poisonous chemicals including nitrogen dioxides, sulphurdioxide volatile organic compounds like benzene, toluene, xylene and hydrogen sulfide, as well as carcinogens like benzapyrene and dioxins. Humans exposed to such substances can suffer from respiratory problems. These chemicals can aggravate asthma, cause breathing difficulties and pain, as well as chronic bronchitis. Benzene, known to be emitted from chemical in water in undocumented quantities, is well recognized as a cause for leukemia and other blood-related diseases. A study done by Climate Justice estimates that exposure to benzene would result in eight new cases of cancer yearly in Bayelsa State alone.

Marine pollution like gas flaring is often close to communities and regularly lack fencing or protections for villagers who risk working near their heat and water. Many communities claim that nearby marine pollution cause acid rain which corrodes their homes and other structures, many of which have zinc-based roofing. Some people resort to using asbestos-based material, which is stronger in repelling acid rain deterioration. Unfortunately, this contributes to their declining health and the health of their environment. Asbestos exposure increases the risk of forminglung cancer, pleural and peritoneal mesothelioma, and asbestosis.

Whether or not flares contribute to acid rain is debatable, as some independent studies conducted have found that the sulphur dioxide and nitrous oxide content of most flares was insufficient to establish a link between flaring and acid rain. Other studies from the U.S. Energy Information Administration (EIA) report that gas flaring is “a major contributor to air pollution and acid rain.”

Older flares are rarely relocated away from villages and are known to coat the land and communities with soot and to damage adjacent vegetation. Almost no vegetation can grow in the area directly surrounding the flares due to their heat.

In November 2005 a judgment by the Federal High Court of Nigeria ordered that gas flaring must stop in a Niger Delta community as it violates guaranteed constitutional rights to life and dignity. In a case brought against the Shell Petroleum Development Company of Nigeria (Shell), Justice C. V. Nwokorie ruled in Benin City that “the damaging and wasteful practice of flaring cannot lawfully continue.” As of May 2011, Shell had not ceased gas flaring in Nigeria.