Every morning, a window opens, revealing a world that works silently. The air enters slowly, water flows somewhere in the house, and in the distance, the city murmurs. Everything moves as part of a machinery that sustains daily life without asking for attention. This backdrop is, in fact, the system that enables every gesture, every object, and every routine. However, few take a moment to consider what would happen if it were to disappear.
This is why we aim to explain what exactly the environment is, how it functions, and why its deterioration is becoming increasingly noticeable. Understanding this is not a theoretical exercise; it’s a way to interpret what is already happening outside.
What is the Environment and Why is it Essential for Life?
The term “environment” is not a vague concept nor a modern invention. The Royal Spanish Academy defines it as the “set of external physical and biological components with which living beings interact.”
In more technical terms, as detailed by the United Nations Conference on the Environment in Stockholm, the environment consists of biotic, abiotic, and socioeconomic factors that interact permanently with one another. In other words, everything around living beings is part of the environment, including what we produce as a society.
So why is it essential? Because it supports all the systems that make life possible, from breathable air and drinking water to the fertile soils on which our food depends. It also regulates major planetary processes—the cycles of water, carbon, and oxygen—that maintain climate balance and allow life to thrive.
Moreover, the environment houses the biosphere, the only known place in the universe where life exists. It supports human, economic, and cultural development. When this system deteriorates, the consequences are swift: health, security, and biodiversity risks increase.
How the Environment is Composed
The environment operates as an interconnected system traditionally divided into four major spheres, to which contemporary science has added a fifth: the anthroposphere. Together, they form a dynamic gear in which matter and energy circulate continuously.
Hydrosphere
This includes all the water on the planet: oceans, rivers, lakes, glaciers, and aquifers. Although it covers 70% of the Earth’s surface, only 2.5% is fresh water, a critical resource threatened by plastic pollution, chemicals, and agricultural runoff, as warned by the UN .
Additionally, the oceans absorb about 90% of the excess heat caused by greenhouse gases. In the Mediterranean, this “extremely warm” heating acts as a pressure cooker that disrupts ecosystems, climate, and regional currents.
Atmosphere
This is the layer of gases that protects the Earth, filters ultraviolet radiation, and regulates the planet’s temperature like a massive natural thermostat. However, it is also one of the most vulnerable layers.
According to the UN, air pollution is the greatest environmental threat to human health, responsible for millions of premature deaths each year. The troposphere—the lowest layer where we live—is thickening by 50 to 60 meters per decade due to global warming, modifying climate dynamics and intensifying storms and extreme phenomena.
Lithosphere or Geosphere
This is the solid part of the planet: soils, rocks, mountains, and sediments. It serves as the physical support for ecosystems and agriculture but is also fragile.
The European Environment Agency warns that intensive agriculture, massive urbanization, and large infrastructures are degrading soils, altering sediments, and compacting land that loses fertility and biodiversity.
Biosphere
This includes all ecosystems where life develops. Biodiversity is not only about species but also their genetic variability and the interactions that keep natural systems functioning. In summary, it is a complex network; if one link breaks, everything else weakens.
Anthroposphere
Contemporary science incorporates a fifth sphere: the anthroposphere, which includes all human activities and artificial environments we’ve created (cities, industries, infrastructures, crops). This recognizes that humans are not outside the environment but immersed within it, and our actions can damage, alter, or restore it.
This sphere also operates biotic elements, such as the human population, microorganisms associated with our activities, or flora and fauna inhabiting urban areas; abiotic elements like air, water, light, temperature, or minerals we use; and artificial elements including everything built: roads, buildings, energy systems, machinery, communication networks, or agricultural landscapes.
Human Impact on the Environment
There is an uncomfortable truth: humans are the species that has most transformed the planet, often profoundly and at unprecedented speed. The European Environment Agency notes that intensive agriculture is the greatest environmental pressure in Europe; fertilizers, pesticides, land drainage, and land modifications have led to declines in birds, insects, and pollinators. Nearly 50% of environmental pollution in Europe comes directly from agricultural practices.
However, this isn’t the only front; deforestation, overfishing, mining, and rapid urbanization are accelerating the global loss of biodiversity. For example, the Mediterranean has experienced “extremely warm” temperatures for months, while the Atlantic is warming faster partly due to reduced reflective clouds previously generated by marine traffic with high sulfur levels. Humanity is dangerously close to exceeding the 1.5 °C warming threshold, approaching irreversible tipping points like coral collapse or the irreversible degradation of the Amazon.
The Environment and Renewable Energies
The energy transition is essential to halt global warming, but it cannot be done at any cost. The European Environment Agency reminds us that renewable energies must be planned in coordination with biodiversity policies: wind turbines can impact birds and bats, dams can block migratory fish and alter sediments, and poorly located solar panels can occupy valuable habitats.
However, there are promising exceptions: geothermal energy, a constant, stable, and silent renewable independent of the weather. The European Union aims to multiply its use, and Spain—especially the Canary Islands—holds notable potential. Nonetheless, it requires costly investments and complex geological studies.
Current Threats to the Environment
The environment now faces a combination of unprecedented pressures. While each ecosystem responds differently, five major cross-cutting threats can be identified: deforestation, pollution, climate change, biodiversity loss, and overexploitation.
Deforestation
Agricultural expansion, urbanization, intensive livestock farming, and indiscriminate logging are behind forest loss in numerous regions worldwide. In Europe, the European Environment Agency warns that intensive logging and the deterioration of mature forests continue to undermine biodiversity and carbon storage.
Pollution
The World Health Organization considers air pollution the greatest environmental threat to human health. Water and soil contamination is also on the rise due to the use of pesticides, fertilizers, and waste.
Furthermore, the UN warns that 85% of marine debris is plastic, and if no action is taken, this figure could triple by 2040. Moreover, the reduction of sulfur in ships has improved air quality but also reduced certain reflective clouds that cooled the oceans, contributing to marine warming.
Climate Change
Climate change fundamentally refers to the prolonged alteration of the planet’s climate patterns due to increased greenhouse gases. Its effects are already visible across all natural systems. The oceans, which act as a thermal buffer, are absorbing around 90% of excess heat, causing increasingly evident imbalances.
This is just one of many examples. As we mentioned, the troposphere is thickening, a phenomenon that alters atmospheric dynamics and favors increasingly extreme episodes. Meanwhile, vulnerable ecosystems like coral reefs show signs of collapse from thermal stress, while on land, prolonged droughts, torrential rainfall, and increasing intense weather phenomena multiply. All signs suggest we are entering a phase characterized by greater climate instability and increasing environmental vulnerability.
Biodiversity Loss
Biodiversity loss is one of the planet’s deepest silent crises. Its main drivers are clear: habitat destruction and fragmentation, species overexploitation, contamination, advancing climate change, and the spread of invasive species that displace native flora and fauna. Each of these factors acts as a cog in a machine that disrupts ecological balance.
The European Environment Agency adds a crucial element: pollinators—bees, butterflies, and bumblebees—are among the most affected by intensive agriculture. Their decline directly threatens food production, as much of European agriculture depends on them. Thus, biodiversity loss is not merely an ecological issue; it’s an immediate risk to food security and the stability of natural systems.
Invasive Species
Invasive alien species have become one of the fastest and most challenging threats to European ecosystems. According to the European Environment Agency, many of these species arrive through trade, maritime transport, or accidental releases, and once established can spread unchecked due to the absence of natural predators in their new environment.
Some examples illustrate the problem well: the American mink and the raccoon prey on birds, amphibians, and small mammals, completely altering food chains in riparian and forest ecosystems. In aquatic environments, the comb jellyfish—introduced through ships’ ballast water—has arrived to collapse entire fish populations in seas like the Black Sea. On land, invasive plants like Japanese knotweed or Impatiens glandulifera form dense masses that displace native vegetation, eroding riverbanks and reducing local biodiversity.
All these invasions have a cumulative effect: they degrade habitats, displace native species, and hinder the natural regeneration of ecosystems.
Overexploitation
The overexploitation of natural resources represents one of the most persistent and silent pressures on ecosystems. Activities like intensive fishing, poaching, and uncontrolled mineral extraction are pushing many species and habitats to the limit of their regeneration capacity.
Consequently, overexploitation not only depletes resources but also weakens the planet’s ability to sustain life in the long term.
How to Care for the Environment
The deterioration of our environment is not an inevitable fate but the result of economic, political, and cultural decisions made over decades. Fortunately, there are clear pathways to reverse that damage.
Measures at the Institutional Level
Institutions—governments, environmental agencies, and international organizations—must drive changes that transcend individual actions. Their regulatory and planning capacity allows for large-scale actions on energy, agricultural, and economic models that pressure the planet. Here are some proposed measures:
Measures at the Individual Level
While political decisions set the course, environmental protection also depends on daily gestures. Small actions, repeated by many individuals and sustained over time, reduce impacts and foster collective habits. Here are some measures:
- Reduce waste and avoid single-use plastics. Bags, bottles, and disposable containers are a direct source of pollution.
- Conserve energy and water. Small decisions like turning off lights, improving insulation, using efficient appliances, or reducing water consumption.
- Use public transportation or bicycles.
- Separate and recycle waste.
- Buy sustainable products and support responsible companies.
- Keep green spaces clean. Do not leave waste in parks, mountains, or beaches as it protects local biodiversity.
- Reuse containers and opt for renewable energies when possible. Giving a second life to objects and contracting green energy at home reduces emissions and encourages a more circular and responsible economy.
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