Environmental Issues
Overview
Environmental Issues form a critical component of the Social Studies / Social Sciences section in PSTET Paper II. This topic bridges science and social understanding, testing your knowledge of how human activities impact the natural world and what measures can address these challenges. Questions typically assess factual recall (types of pollution, international agreements, conservation methods) as well as conceptual understanding (causes and effects, sustainable development principles).
For PSTET, expect questions linking environmental concepts to the Indian and Punjab context—air pollution in industrial cities, water issues in the state's rivers, agricultural practices affecting soil health, and government schemes for conservation. Mastery here requires knowing definitions, causes, effects, and solutions across pollution types, understanding climate change basics, and grasping the meaning and pillars of sustainable development.
Key Concepts
- **Pollution** is the introduction of harmful substances or energy into the environment, degrading air, water, soil, or causing noise/light disturbances. It has natural and anthropogenic (human-caused) sources, with the latter being the primary concern.
- **Air pollution** results from vehicular emissions, industrial discharge, burning of fossil fuels and crop residue (stubble burning is a major issue in Punjab), releasing pollutants like CO, SO₂, NOₓ, and particulate matter (PM 2.5, PM 10).
- **Water pollution** occurs when industrial effluents, agricultural runoff (pesticides, fertilisers), sewage, and plastic waste contaminate rivers, groundwater, and lakes. Punjab faces groundwater depletion and contamination from excessive tubewell use and chemical farming.
- **Soil pollution** arises from excessive use of chemical fertilisers, pesticides, improper waste disposal, and industrial waste, leading to loss of soil fertility and entry of toxins into the food chain.
- **Climate change** refers to long-term shifts in global temperatures and weather patterns, primarily driven by the enhanced greenhouse effect due to CO₂, methane, and nitrous oxide emissions from human activities.