Why there’s no health without the Ocean.

A healthy Ocean is our greatest ally against climate change.

Our health depends on the Ocean.  

This statement is true, of course, but it’s very easy to become desensitised to this idea when it all seems so abstract. 

In this modern world, it’s easy to overlook the fundamental basis of our survival that we often take for granted.

It can be hard to directly link our everyday lives and habits to the Ocean, especially for those of us who don’t live anywhere near the coast, and don’t interact with the sea on a regular basis. 

This can leave many of us feeling disconnected and disengaged from Ocean action. 

A quote saying "Our health depends on the Ocean" in a science article discussing why a healthy Ocean is key to our survival.

But let’s dive deeper into this statement to find out what a healthy Ocean really means to us (humanity), and why we should must care.

A healthy Ocean is key to our survival 

In fact, the Ocean provides all the fundamental resources that we need to survive:

1. Air: The oxygen in every second breath we take comes from the Ocean.

It’s also believed that tiny, single-celled algae called Cyanobacteria provided the atmospheric conditions suitable for our very existence around 2.4 billion years ago.  (That’s referred to as the Great Oxidation Event.)  

2. Water: All water on the planet is connected by a system known as the hydrological cycle.

Water evaporates from the Ocean’s surface to form clouds, which provide us with the fresh water that we use to drink, shower, and cook with.  

It’s all connected via rivers, streams, and groundwater tables.

Even the water that makes up 60% of your own body was part of the Ocean at some point. 

Our Ocean provides air, water, food and shelter for our survival.

3. Food: Seafood provides a primary source of protein for over 3.3 billion people.

That’s over 40% of the global population (8.1 billion in 2023). The Ocean also drives the rain systems and climate patterns which help our crops to grow.

So even if you don’t eat fish, the Ocean still indirectly provides the food that you eat.

4. Shelter: The Ocean has been present during every element of our evolutionary history as human beings and continues to shape the way our society functions. 

River basins, where land meets the sea, represent the earliest relationship between human society and nature. These areas of fertile plain fields, rich soil and abundant water resources allowed for the very first human civilisations to thrive.  

Over time, the development of ports also provided a gateway of connectivity and transportation between societies.  

This relationship continues today.  

As of 2020, almost 1 billion people live within 10km of the coastline, and more than one third of the world’s population (2.75 billion people) live within 100km from the coast. 

What’s more, over 3 billion people depend on the Ocean as a primary source of income, the majority of these from Ocean-based industries such as fisheries and tourism in developing countries. 

Why healthy people need a healthy Ocean: explained by Ocean generation, leaders in Ocean literacy.

Healthy people need a healthy Ocean 

The Ocean contains a vast biodiversity of life, with over 250,000 known species and many more (at least two thirds) yet to be discovered.  

Each life form has a unique method of adaptation against disease and pathogens. We’re constantly learning from this strange and alien world to apply these mechanisms to our own needs.  

We depend on this marine biodiversity to develop modern medicines. In fact, between 1981-2008, around 64% of all drugs used to fight infection, and 63% of anti-cancer drugs were derived from natural sources.  

For example, the Horseshoe Crab is commonly referred to as a “living fossil” and has survived almost unchanged for around 200 million years. Its blue blood contains special cells called “granular amoebocytes” which can detect and clot around even the tiniest presence of toxic bacteria.  

Humans harness the special property of this blood to test whether the drugs and vaccines that we produce are free from contamination.

A healthy Ocean is our greatest ally against climate change.

A healthy Ocean is our greatest ally against climate change. 

A healthy Ocean stabilises our entire planetary system and acts as a buffer against the worsening impacts of climate change.  

It regulates global air temperatures by absorbing 26% of total CO2 emissions and storing over 90% of the excess heat from the atmosphere.  

But the Ocean is not just a victim of climate change, it’s also a source of solutions.

Our Ocean provides all the fundamental resources that we need to survive. Written by Ocean Generation.

Coastal “blue carbon” ecosystems, such as mangroves, tidal marshes and seagrass meadows remove and store carbon dioxide from the atmosphere. These ecosystems can lock away carbon in their soils at rates up to an order of magnitude faster than terrestrial forests.

Protecting and restoring these vital coastal ecosystems offers us a chance to ensure a sustainable future for people and planet.  

If the Ocean thrives, so do we.  

So, next time you’re having a drink of water, catching your breath after exercising, or waiting at the doctor’s surgery for some medicine, take a moment to stop and thank the Ocean for providing the fundamentals to make all this possible. 

Our Ocean is not just a victim of climate change, it's a source of solutions.

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Diving into Kalk Bay: Exploring its past, present, future 

My earliest, enduring memory of the Ocean is a stretch of sea rolling away from a vibrant fishing harbour in Kalk Bay, Cape Town.  

The harbour’s position along the False Bay Coast, as well as its rich marine life, played a crucial role in the city’s early development and prosperity. Little did I know this place would also play an important role in my own life. 

Kalk Bay: A link to my childhood and the last connection to my grandmother.

The colourful fishing boats in the harbour that frame the glorious, shimmering stretch of Ocean in my mind like a postcard, idealised to a point far from reality. Today, with names like Star of the Sea and Lucky Strike, those old wooden boats seem struck in a rapidly receding past.

Change has come in great variety and moved with incredible momentum. All aspects of the scene have been altered – from the oceanography and to the social structures and human dimension surrounding the harbour. 

I find it interesting and unsurprising, that when asked to think of a memory about the Ocean, the one I recall is so entangled with the influence of mankind. These two elements – human and Ocean – have been linked for centuries and seem unable to escape one another.

Wavemaker Story by Katie about Kalk Bay, Cape Town's past, present and future.

I feel this tension reflected in the complex and often contradictory nature of our social and ecological aims moving forwards as a society.

Progression too often comes at the high cost of our marine health, a lack of respect for our past and insufficient foresight for our future. All of this points to the difficulty in honouring and preserving our collective pasts whilst building future horizons in sustainable ways.

New strategies for managing the natural environment and its resources should include integrated approaches with new frameworks, stakeholders and communities. 

Kalk Bay as we see it today  

The Kalk Bay area may be reminiscent of the past, but the issues it faces are very much of the present. The harbour is one of the few still in operation, albeit a far cry from its thriving commercial days. Subsistence fishing (the practice of catching fish for personal consumption and not profit) is carried out with a handful of crayfish boats heading out each day. 

With reduced operation has come tourism and commercialisation. You will find restaurants, pop up stalls selling gimmicks, and seals, who emboldened and adjusted to the crowds, sunbathe on the jetty.     

Seal sunbathing on the jetty at Kalk Bay, Cape Town.

Just as the Ocean below has been altered by rising sea levels and an increased frequency of extreme temperature events, so too has the harbour. Unsurprisingly, the advancements and demands of modern life have been the indirect driving forces behind this change.

All the usual culprits – overfishing, climate change, overpopulation, and coastal development- are part of this problem.  Fish stocks caused by overfishing and the violations of size regulations have impacted marine biodiversity and the livelihoods of local fisherman. 

Coastal development have also contributed significantly to these detrimental changes by increasing pollutant runoff and nutrient loading.

This illustrates just how interrelated Ocean and coastal ecosystems are and how integral they are to both human and aquatic life.

Progression at Kalk Bay, Cape Town too often comes at the high cost of our marine health, a lack of respect for our past and insufficient foresight for our future. Article by Ocean Generation, leaders in Ocean education.

Not all hope is lost for Kalk Bay  

Thankfully, there’s been a growing awareness of and respect for some of these pressing human-made threats, which has led to the establishment of marine protected areas. Currently, 15 % of South Africa’s total marine areas are protected with 1.7 % of this area fully protected.

Evidently, the South African constitution recognises the need for these conservation efforts and acknowledges the responsibility that the fishing and tourism industries have.

Eco-tourism has emerged as a way of protecting and sustainably using the environment, without negatively impacting economic growth and job security.  

A growing awareness in South Africa has led to the establishment of marine protected areas.

We need solutions that engage local communities living in coastal areas. This would encourage the safeguarding of natural resources, improve the quality of people’s lives, and potentially assist in building bridges between sections of South African society that has historically been divided.

Approaches such as these work towards achieving a balance between developmental goals and environmental concerns; it’s of course an ongoing process. Therefore, it’s important to thoroughly research and address the priorities and gaps in this area with input from various stakeholders.

Katie, a Wavemaker tells us: My grandmother’s childhood saw the days when man could still outrun his actions without stopping to catch his breath and consider the implications.

My grandmother’s childhood saw the days when man could still outrun his actions without stopping to catch his breath and consider any of the implications. The harmony between human and Ocean that existed was only ever on a short-term loan, one with dangerously high interest.

The future seemed as it always does to those on the shores of the present: An island far away.

Katie, a Wavemaker shares this quote: My faith in the [...] next generation of changemakers gives me hope for the future of our marine and coastal ecosystems.

The generation of young people to which I belong to understand that preservation isn’t about merely respecting the present but also about securing the future. Therefore, my faith in the collective creativity and problem-solving abilities of the next generation of changemakers gives me hope for the future of our marine and coastal ecosystems.


Thank you for raising your voice for the Ocean, Katie!

Connect with Katie Birditt via LinkedIn or her Instagram page. Learn about how to submit your own Wavemaker Story here.

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