Environment & Energy

Protecting the Oceans

The question
The world's oceans are becoming increasingly polluted, threatening marine life and human wellbeing. What are the main causes of ocean pollution, and what steps can be taken to protect the seas?

Band 9 model answer

Once regarded as boundless and indestructible, the world's oceans are now choking on human waste, endangering marine ecosystems and the billions who depend upon them. This essay will identify the principal sources of ocean pollution and recommend measures to safeguard the seas.

The causes of this degradation are predominantly terrestrial. The greatest culprit is plastic, much of which originates on land and is carried by rivers into the sea, where it fragments into microplastics that pervade the food chain. Agricultural runoff laden with fertilisers triggers oxygen-starved dead zones, while untreated sewage and industrial effluent introduce toxic chemicals directly into coastal waters. Oil spills and discarded fishing gear inflict further, often catastrophic, harm on marine habitats.

Protecting the oceans calls for action on multiple fronts. The most urgent priority is to stem the flow of plastic by curbing single-use packaging, improving waste management and holding manufacturers accountable for the lifecycle of their products. Governments should also enforce strict limits on industrial and agricultural discharge and expand networks of marine protected areas where ecosystems can recover. Because pollution respects no borders, international cooperation is indispensable; treaties that bind nations to shared standards offer the only credible path to lasting protection.

In conclusion, ocean pollution arises chiefly from plastics, agricultural runoff and industrial waste flowing from the land. Reversing it will require concerted regulation, cleaner production and genuine global collaboration. The oceans sustain all life on Earth, and protecting them is not merely desirable but absolutely imperative.

Examiner’s notes

Power words for this topic

effluent
liquid waste discharged into water
In a sentenceIndustrial effluent poisons coastal waters.
runoff
water that drains off land carrying pollutants
In a sentenceAgricultural runoff creates ocean dead zones.
pervade
to spread throughout something
In a sentenceMicroplastics pervade the marine food chain.
imperative
of vital and urgent importance
In a sentenceProtecting the oceans is absolutely imperative.