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A Plan to Rescue the Blue Planet

The views expressed are those of the author and are not necessarily those of Scientific American.


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Most of us experience the ocean looking out from a beach during vacation or maybe flying over it in a plane. It seems vast, ancient and invulnerable. It is hard to imagine that up to 80 percent of life lives below the waves, throughout 1.3 billion cubic kilometers of water and across a seabed comprising mountain ranges, vast plains and trenches reaching to nearly 11,000-meters-deep.

The ocean spawned life, it gave rise to the biological revolution of photosynthesis that pumped our atmosphere full of oxygen and with the first crawling upon the land by our vertebrate ancestors, led to us. With the ocean now providing nearly 50 percent of Earth’s oxygen, every second breath we take originates from the marine environment. The ocean feeds billions of us and, through other services it provides, plays a critical role in supporting the ecology of Earth that we ultimately rely on. Many of these services we do not recognize and certainly do not value. For example, the ocean has absorbed up to 50 percent of the carbon dioxide produced by burning fossil fuels, mitigating the greenhouse gas’s role in global warming.

An orange roughy swims along Southwest Indian Ridge approximately 1,000 meters deep. Members of this species can live more than 100 years, but have been overfished globally by bottom trawl fisheries.

A large paragorgia arborea colony on Atlantis Bank seamount, approximately 700 meters deep. Deep-sea corals can live for thousands of years and are highly vulnerable to the mechanical impacts of deep-sea bottom trawling.

Our relationship with the ocean has become an abusive one. Industrial fishing has led to a catastrophic collapse of both the species we target and those taken as by-catch. Populations of many of the iconic predators of the oceans—tuna, swordfish, sharks and even cod—have been reduced to less than 10 percent of their unexploited abundance. Our inexorable appetite for profit from fisheries has led us to trawl deep and remote seamounts and other deep-sea ecosystems for fish that can live for more than 100 years whilst also destroying vulnerable marine ecosystems such as deep-sea coral reefs and sponge gardens that support an enormous diversity of life.

Pollution has now reached every part of the ocean. We can see that plastic debris kills through ingestion or entanglement a variety of animals including seals, turtles (which mistake it for their jellyfish food), whales and seabirds. What is not so obvious are the microplastic particles that are now found everywhere in the ocean and which may be introducing toxins into food chains.

A fisherman's glove on a remote seamount in the Southern Indian Ocean. Plastic debris is now ubiquitous in the ocean.

The effects of climate change are now taking hold on the oceans. Warming, ocean acidification and declining oxygen levels are all symptoms that in ancient oceans have been associated with severe disturbances to the carbon cycle. They have often been associated with cataclysmic extinction events including some of the “big five” major extinctions on Earth. As a result of our greenhouse-gas emissions, changes in marine ecosystems are occurring globally. Some species are on the move to stay within waters of their preferred temperature, the timing of events such as spawning is changing, and mass mortality of marine life are occurring as a result of extreme warming events or the sudden encroachment of deoxygenated waters on coastal ecosystems.

It is easy to be overwhelmed by the tragic spiral of degradation that we are witnessing in the oceans. However, it is still the greatest wilderness on Earth. Many of the human activities that are damaging the oceans can be modified so they are less harmful, and reduced so the ocean can recover. Fishing, for example, is an activity where we have a clear understanding of the causes and results of overexploitation and damaging practices. There are achievable fixes such as simple modifications to fishing gear to eliminate some forms of by-catch. Making all fishing vessels carry a mandatory identification number, as other merchant vessels do, could make enforcement of fishing regulations much easier. Dealing with overcapacity in fishing fleets and subsidies that lead to overfishing is possible.

A toothfish longliner, Chile.

Why are these measures not being implemented? The ocean is governed mainly through the principles of the United Nations Convention on Law of the Sea. However, implementation of the provisions of the international law is spread across a plethora of sector-specific organizations that focus on the exploitation of marine resources rather than their conservation. This has made it easy for the interests of single states and industrial concerns to undermine the management of the ocean for the maximum benefit of humankind collectively. Nowhere has this been more acute than in the high seas, the waters that lie beyond 200 nautical miles from the coast and which are subject to international rather than state-based regulation.

Given the degradation of the oceans and a burgeoning human population predicted to reach 9 billion or more by the middle of the century, we cannot allow 19th-century-style politics to rule the waves. It is time to act collectively to rescue the oceans so that they continue to provide critical services and inspiration for our children and for generations thereafter. On June 24, the Global Ocean Commission launched “A Rescue Package for the Global Ocean,” which comprises eight sets of recommendations for practical solutions to the causes of degradation of high seas and lays out an agenda to move the oceans from decline to recovery. It is nothing less than a “Marshall Plan” for the oceans, a reflection of the scale of the emergency we face.

All images courtesy of Alex Rogers.

Alex Rogers About the Author: Alex Rogers is an independent scientific adviser to the Global Ocean Commission, a professor of conservation biology at Oxford University’s Somerville College and Scientific Director of the International Programme on the State of the Ocean. Follow on Twitter @AlexDavidRogers.

The views expressed are those of the author and are not necessarily those of Scientific American.






Comments 7 Comments

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  1. 1. Dr. Strangelove 11:35 pm 08/21/2014

    “the ocean has absorbed up to 50 percent of the carbon dioxide produced by burning fossil fuels, mitigating the greenhouse gas’s role in global warming.”

    This is good for sea plants. They need CO2 to grow.

    “Warming, ocean acidification and declining oxygen levels are all symptoms that in ancient oceans have been associated with severe disturbances to the carbon cycle.”

    The pH of the ocean is 8.0 or basic not acidic. It is becoming less basic because of increasing fresh water content. Water is neutral (pH 7.0) If you want seawater to be more basic, decrease fresh water and add more bicarbonate salt. Declining oxygen is due to decomposing sea life such as dead algae, etc. which consumes oxygen. Less sea life, less decomposition, more oxygen.

    “Some species are on the move to stay within waters of their preferred temperature”

    They prefer warm temperature. The greatest biodiversity is found in warm tropical seas. They don’t like cold water. More warm seas, more biodiversity.

    Link to this
  2. 2. QRIUS1 9:08 pm 08/25/2014

    I thought that the article was very well written. It is hard to tell if you are being positively or negatively critical. In other words, what is your point? And if I’m correct, fish like cod prefer cold water. The cod population is declining in, of all places, Cape Cod. “More warm seas, more biodiversity”? Where in Hell are the cod and polar bears and penguins going to survive when glaciers in the Arctic and Antarctic are melting from global warming’s higher temperatures?

    Link to this
  3. 3. enrico 11:54 am 08/26/2014

    In this blog entry, I argue why we won’t have a major change towards a sustainable society, even though such an outcome is necessary. https://uvachemistry.wordpress.com/category/sustainability-2/

    Link to this
  4. 4. Dr. Strangelove 4:35 am 08/27/2014

    Cod fish declined because we eat them. If we don’t eat them, they will spawn and overpopulate the sea. At the rate the glaciers are melting, the next ice age will come before they melt. Many species will die of extreme cold. Our greenhouse gases might make the ice age more tolerable. BTW glaciers are beginning to form in Scotland. People in Siberia wish it will be warmer.

    Link to this
  5. 5. Anchovy_Rancher 5:50 pm 08/28/2014

    Strangelove- And you “know” this because? Speaking directly to your comment about Cod. “Overpopulate?”

    I was, at times in the past, a commercial fisherman. Mostly Alaska and Washington State, a bit in Florida. When one species “overpopulates” there is always, without fail, a predator species right there to take advantage of the situation. The “overpopulated” species becomes the new entree of the week. Right now, humans are filling that niche. If we weren’t around, it would be another Apex Predator.

    ‘Nuff said?

    Link to this
  6. 6. Anchovy_Rancher 5:53 pm 08/28/2014

    Also, your “warm water theory” is full of holes. It’s going to sink. Put your life vest on.

    Link to this
  7. 7. Dr. Strangelove 4:39 am 08/29/2014

    Fisherman – You answered your own question. Cod does not overpopulate because we hunt them. That’s what I said. Are you confused? Who is better cod predator than human?

    And your hand waving impresses only the fool. Go to the Great Barrier Reef and see the biodiversity. The Bering Sea had frozen your brain. Warm it up a bit.

    Link to this

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