Nitrogen Pollution: The Silent Threat Amplifying Global Water Scarcity

Context: 

A recent report published in Nature Communication highlights the exacerbation of water scarcity worldwide due to declining water quality, particularly attributed to nitrogen pollution in rivers.

Study On Nitrogen Pollution: Key Findings

• Introduction of “Clean Water Scarcity”: The study introduces the term “clean-water scarcity” and provides a comprehensive assessment considering both water quantity and quality. 
  • This assessment, based on global nitrogen pollution and incorporating various climatic and socio-economic scenarios.
• Impact of Nitrogen Pollution: Sub-basins (smaller working units within a larger river basin or catchment area) with water scarcity triples due to future nitrogen pollution worldwide.
• Expansion of Affected Areas: Water Pollution aggravates water scarcity in >2000 sub-basins worldwide out of more than 10,000 assessed sub-basin.
  • Projected Water scarcity in 2050: 33% of global river sub-basins could face water scarcity.
• Impact on India: Nitrogen pollution is predominantly attributed to agricultural activities in the initial two climate scenarios. 
  • However, sewage is forecasted to become the primary source, surpassing agriculture, in the most severe scenario.
• Projected water scarcity hotspots: Nitrogen pollution could render many sub-basins in South China, Central Europe, North America, and Africa.

About Nitrogen Pollution

• It refers to the excessive presence of nitrogen compounds in the environment, often resulting from human activities such as agriculture, industrial processes, and transportation. 
• This surplus of nitrogen can lead to various environmental problems, including water contamination, air pollution, and disruption of ecosystems.

Sources of Nitrogen Pollution

• Agricultural Fertilizers: Overuse of nitrogen fertilizers can result in the emission of nitrous oxide, a potent greenhouse gas, into the atmosphere. 
• Sewage: 
  • Food Waste: Significant amounts of nitrogen-rich waste are produced during the food production and supply chain, originating from both human and animal sources.
  • Wastewater Treatment: Facilities lacking specific nitrogen removal processes can contribute to elevated nitrogen levels in surface and groundwater. 
  • Stormwater Runoff: Urban areas contribute to nitrogen pollution through stormwater runoff, which carries pollutants such as nitrogen and phosphorus from hard surfaces like roads and rooftops into nearby water bodies. 
• Fossil Fuel Usage (Vehicular Pollution): Diesel-powered vehicles, including trucks and cars, contribute to nitrogen pollution despite advancements in cleaner fuel and pollution control technology.

Impact of Nitrogen Pollution 

• Disruption of Ecosystems: 
  • In aquatic ecosystems: It leads to toxic algal blooms and coastal dead zones, posing a significant threat to biodiversity worldwide. 
  • Groundwater Pollution
  • Deterioration of soil health
• Contribution to Climate Change: Fertilisers and agricultural emissions contribute to climate change through the release of nitrous oxide, a potent greenhouse gas, and ammonia emissions, which lead to the formation of nitrous oxide and fine particulate matter pollution. 
• Health Risks:  Elevated nitrate levels in water sources increase the risk of methemoglobinemia in infants and cancer in adults.
  • Ammonia emissions exacerbate air pollution, impacting human health adversely. 
• Economic Impact: Ranging from US$340 billion to US$3.4 trillion annually, considering its effects on human health and ecosystems.

Steps Taken to Control Nitrogen Pollution 

Conclusion

Addressing nitrogen pollution through sustainable management is crucial for achieving global sustainable development goals and improving economic efficiency.

News Source : DTE