Ask anyone what they know about plankton. They will probably remember the SpongeBob SquarePants cartoon or say that it is "trivial stuff that whales eat." And this answer is both right and wrong at the same time. Plankton is indeed small and does serve as food for many marine creatures. But its significance for the future of humanity cannot be overestimated. It is not just biomass in the ocean, it is the foundation of all life on Earth, a climate regulator, and a potential source of food, fuel, and medicine for future generations. When we talk about plankton, we talk about the key that can open the door to a sustainable future. But are we ready to turn it?
Plankton is a collective term for all organisms that drift in the water column and are unable to actively move against the current. It is not one species, but an entire world: bacteria, algae, tiny crustaceans, fish larvae, and jellyfish. What unites them is that they are at the mercy of ocean currents. But it is this "inability" to actively move that makes them the main drivers of planetary processes.
According to estimates by scientists, plankton accounts for about 95% of the ocean's biomass. This is a colossal figure. It is the basis of the food chain: small zooplankton eats phytoplankton, which is then eaten by larger crustaceans, which are eaten by fish, and fish are eaten by humans. Without plankton, the ocean would be a dead desert. But not just the ocean. Plankton produces approximately 50-80% of the oxygen we breathe. Every second breath of a human is a gift from microalgae that live in the surface layers of the ocean. Forests are called the lungs of the planet, but in fact, oceanic plankton gives us twice to three times more oxygen.
Aside from oxygen, plankton absorbs a huge amount of carbon dioxide, participating in the carbon cycle. When phytoplankton dies, it sinks to the bottom and carries away the associated carbon - this is called the biological pump. This process mitigates climate change and keeps the planet from overheating. If plankton disappeared, the CO₂ level in the atmosphere would skyrocket, and life on land would become impossible.
When we think about the food of the future, we imagine artificial meat or proteins from bacteria. But plankton already exists - it grows on its own, without arable land, fertilizers, and fresh water. Algae, especially spirulina and chlorella, have long been known as superfoods. They contain up to 70% of high-quality protein, vitamins, minerals, antioxidants, and omega-3 fatty acids. Their cultivation is tens of times more efficient than animal husbandry: on one hectare, you can get several times more protein than from soybean fields, and at the same time, do not spend fresh water in large quantities.
Today, spirulina is already produced on an industrial scale in China, India, the United States, and some countries in Africa. It is added to bars, smoothies, pasta, and even bread. But this is just the beginning. Researchers are developing new types of algae that can be grown in saltwater, on marine farms, without competing with agriculture for land and fresh water. In the future, algae may become the main source of protein for the growing population of the planet, which is expected to exceed 9.7 billion people by 2050.
In addition, plankton can be used to produce feed for animals and fish. Today, a significant part of fish meal for aquaculture is produced from wild small fish, which creates a burden on the ocean. Replacing this meal with microalgae and krill will break the cycle and make aquaculture truly sustainable.
Another application of plankton is biofuel. Microalgae accumulate lipids (fats) that can be processed into biodiesel. Compared to terrestrial crops (soy, rapeseed, corn), algae produce 10-30 times more oil per hectare. At the same time, they do not require fertile soils and can be grown on unsuitable for agriculture territories - in deserts, saltpans, and industrial water bodies.
At present, there are pilot projects for the production of algal biofuel, but their profitability is still low. However, with the rise in oil prices and the development of technologies for extracting lipids, this sector may become economically viable. In addition, algae can be used to produce bioplastics that decompose in nature without toxic residues. In a world suffocating from plastic waste, this could be a real salvation.
Marine organisms have always been a source of unique chemical compounds, and plankton is no exception. Many species of algae and cyanobacteria produce substances with antiviral, antibacterial, and anticancer properties. For example, phycocyanin, a powerful antioxidant extracted from spirulina, is used in immunology and oncology. Some types of microalgae synthesize fatty acids that help with inflammatory diseases and metabolic disorders.
Especially promising are studies in the field of neurodegenerative diseases. Compounds released from plankton can protect nerve cells and slow the progression of Alzheimer's and Parkinson's diseases. Work is also underway to create vaccines based on algae - their genetic structure allows them to be used as bioreactors for producing antigens. In the future, microalgae may become the basis of "green pharmaceuticals" that are affordable and affordable for developing countries.
Today, when the world is fighting against warming, the role of plankton becomes critical. Plankton absorbs carbon dioxide not only through photosynthesis but also through the formation of organic and inorganic particles that settle to the bottom. This process, called the "biological pump," removes up to 4 billion tons of carbon from the atmosphere annually. This is comparable to the emissions of all cars in the world.
However, there are also worrying trends. Global warming is changing the temperature and acidity of the ocean, which threatens plankton. Many species are unable to adapt and their numbers are declining, especially in tropical regions. This could weaken the biological pump and intensify the greenhouse effect. Scientists are working on technologies to stimulate the growth of phytoplankton - for example, by adding iron to nutrient-poor areas of the ocean. Experiments show that such "iron fertilizers" can cause massive blooms of algae and bind more carbon. However, this approach requires caution to not disrupt the delicate balance of the ecosystem.
In the more distant future, plankton may become part of climate engineering - for example, for creating artificial clouds or absorbing excess heat. This sounds like science fiction, but research is already underway.
The plankton economy is not just biofuel and medicines. It is an entire industry: the production of cosmetics based on algae, food additives, feed additives for animals, bioplastics, textiles, and even construction materials. Algal biofilms are already used in packaging, and some companies are developing algal "bricks" for building eco-friendly homes. The development of these areas can create millions of jobs, especially in coastal regions and developing countries where there is access to the ocean but no fertile land.
It is important that this growth is inclusive and ethical. Small farmers and cooperatives should have access to technologies and markets so that they do not become victims of large corporations. There are already projects to train local communities in the cultivation of algae and organize sales. This is especially relevant in Africa, Asia, and Latin America, where aquaculture can become a driver of sustainable development.
Of course, there is also the flip side of mass cultivation of plankton. Like any monoculture production, cultivating one species of algae can lead to a decrease in biodiversity and the spread of diseases. Adding fertilizers to the ocean can disrupt natural cycles and cause toxic algal blooms. Therefore, all these technologies require thorough environmental expertise and regulation.
In addition, there is an ethical question about who should control planetary plankton. If private companies patent algae strains and genetic sequences, this could lead to monopolization and inequality. Therefore, the international community should develop principles for fair distribution of resources and knowledge, similar to how genetic resources in agriculture are managed.
This may sound incredible, but plankton is already being considered as an essential component for long-term space missions and colonization of other planets. In a closed ecosystem of a future Martian settlement, algae can perform several functions: produce oxygen, absorb carbon dioxide, purify water, provide biomass for food, and even serve as raw material for construction. Microalgae grow quickly and do not require complex equipment, making them an ideal candidate for bioregenerative life support systems.
Experiments on the International Space Station have shown that algae successfully adapt to microgravity and radiation. It is possible that just plankton will become the "bread" for future space conquerors, just as dates were for caravan merchants in the desert.
Plankton is an invisible continent on which our world stands. It feeds us, quenches us, protects us from climate disasters, and even cures us. We are only beginning to understand its potential, but it is already clear: the future of humanity depends to a large extent on how we will deal with this microscopic wealth. We need not just consume but also protect, not just exploit but also study. Plankton is a strategic resource of the 21st century, and how we manage it will determine whether our civilization can survive crises and reach a new level of development. We stand at the threshold of a "blue revolution," and its main hero is a tiny organism that we cannot even see with the naked eye.
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