Environmental Pollution & Global Warming Explained | Health Effects, Economic Impacts & Greenhouse Gases
Environmental pollution has become one of the major challenges facing human society. Air pollutants and toxic substances can affect human health, animals, buildings, visibility, sunlight and the environment. At the same time, greenhouse gases contribute to the rise in global temperature.
1. Effects on Human Health
Different pollutants can produce serious health problems:
Carbon monoxide (CO): CO combines with haemoglobin to form carboxyhaemoglobin (COHb), reducing the oxygen-carrying capacity of blood. This can cause headache, dizziness, unconsciousness and, at high exposure, death.
Lead (Pb): Long-term exposure may affect the nervous system, blood formation, kidneys and other organs.
Radioactive substances: Radioisotopes such as strontium-90 (Sr-90) can accumulate in bones, while iodine-131 (I-131) can affect the thyroid.
Air pollution can also aggravate respiratory and cardiovascular problems.
2. Effects on Animals
Pollution can adversely affect animals through contaminated air, water and food.
For example, fluoride contamination can cause dental fluorosis and damage teeth in animals when exposure is sufficiently high. Toxic pollutants can also accumulate in food chains and affect animal growth, reproduction and survival.
3. Economic and Physical Effects
Air pollutants can damage materials and infrastructure.
Corrosion and deterioration
Corrosion and tarnishing of metals
Decay of building materials and stone monuments
Weakening and fading of textiles and leather, particularly due to pollutants such as SO₂
Damage to manufactured materials
Cracking of rubber
Discolouration of paper
Deterioration of building paints and coatings
These effects increase maintenance and replacement costs, creating an economic burden.
4. Effects on Visibility and Sunlight
Air pollution containing fog, smoke, dust and fine particles can reduce visibility.
Reduced sunlight can also influence natural processes such as photosynthesis. Atmospheric pollutants may therefore affect ecosystems as well as human activities such as transportation.
Global Warming
Global warming is the long-term increase in Earth's average surface temperature. It is closely associated with the enhanced greenhouse effect caused by increasing concentrations of greenhouse gases.
Major greenhouse gases include:
Carbon dioxide (CO₂)
Methane (CH₄)
Nitrous oxide (N₂O)
Ozone (O₃)
Water vapour (H₂O)
Certain industrial gases, including CFCs
These gases absorb and re-emit infrared radiation, contributing to warming of the Earth's climate system.
Major Sources of CO₂
The major human sources of carbon dioxide include:
Coal combustion
Oil and petroleum use
Natural gas
Transportation
Industrial activities
Deforestation and land-use change
Among these, the burning of fossil fuels is a particularly important source of human-caused CO₂ emissions.
Conclusion
Environmental pollution has wide-ranging consequences, from human health problems and damage to animals to the deterioration of buildings, materials and visibility. Meanwhile, greenhouse-gas emissions are driving global warming and climate change. Reducing fossil-fuel consumption, controlling industrial emissions, improving energy efficiency and protecting forests are essential steps toward a healthier environment and a more stable climate.
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Environmental Pollution & Global Warming Explained | Health Effects, Material Damage, Visibility & Greenhouse Gases
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