Unit - 4 Climate Change

 

1. Climate Change

Definition

Climate change refers to the long-term change in Earth’s temperature, rainfall, wind patterns, and overall climate system over decades or centuries.

Climate change includes not only global warming but also changes in weather extremes, seasonal patterns, and ecological balance. Earlier, climate change occurred naturally over thousands of years, but today it is happening rapidly due to human activities.

Examples

  • Increase in global average temperature
  • Irregular monsoon patterns
  • More frequent heatwaves and floods
  • In Gujarat, summers are becoming hotter every year, with temperatures crossing 45°C more frequently.
  • In Himachal Pradesh, snowfall patterns are changing, affecting tourism and agriculture.
  • Globally, countries like Maldives face rising sea levels threatening their existence.

2. Global Warming

Definition

Global warming is the gradual rise in Earth’s average surface temperature due to increased greenhouse gases.

It is mainly caused by human activities such as burning fossil fuels, deforestation, and industrial emissions. These activities increase greenhouse gases, trapping more heat in the atmosphere.

Process

  1. Sunlight enters Earth’s atmosphere
  2. Earth absorbs energy and emits heat
  3. Greenhouse gases trap this heat
  4. Temperature increases

Examples

  • Melting glaciers in Arctic
  • Rising sea levels worldwide
  • Heatwaves in urban cities
  • Cities like Ahmedabad experience extreme heatwaves causing health issues.
  • Farmers in Maharashtra face crop failures due to rising temperatures.
  • Increased use of air conditioners leading to more electricity demand and further warming.

3. Greenhouse Effect

Definition

The greenhouse effect is the process by which greenhouse gases trap heat in the Earth’s atmosphere, keeping the planet warm.

It is a natural process essential for life. However, human activities have increased greenhouse gases, causing excessive heat retention.

Examples

  • Carbon dioxide from vehicles
  • Methane from livestock
  • Industrial emissions
  • Traffic congestion in cities like Delhi increases CO₂ levels.
  • Burning of crop residue in Punjab worsens air quality and enhances greenhouse effect.

4. Ozone Depletion

Definition

Ozone depletion is the thinning of the ozone layer in the stratosphere due to chemical pollutants like CFCs.

The ozone layer protects Earth from harmful ultraviolet (UV) radiation. When it depletes, more UV rays reach Earth, causing serious health and environmental problems.

Examples

  • Use of old refrigerators and air conditioners releasing CFCs
  • Aerosol sprays
  • Increase in skin-related diseases due to higher UV exposure
  • Farmers and outdoor workers facing higher risk of sunburn and eye damage

5. Factors Affecting Climate Change

Definition

These are natural and human-related factors that influence changes in climate.

Types and Examples

Natural Factors

  • Volcanic eruptions (release ash and gases)
  • Solar radiation changes
  • Ocean currents

Human Factors

  • Deforestation
  • Industrial pollution
  • Urbanization

Real-Life Situations

  • Rapid urban growth in Surat leading to increased temperature (urban heat island effect)
  • Loss of forests in Amazon Rainforest affecting global climate balance

6. Impact of Climate Change

Environmental Impacts

  • Melting glaciers
  • Rising sea levels
  • Loss of biodiversity

Examples

  • Coral bleaching in Great Barrier Reef

Economic Impacts

  • Damage to crops
  • Increased disaster management costs
  • Farmers in Rajasthan facing droughts and reduced yield
  • Flood damage in Assam affecting livelihoods

Social Impacts

  • Health issues (heatstroke, respiratory diseases)
  • Migration due to disasters

Examples

  • Climate refugees due to floods and rising sea levels

7. Mitigation of Climate Change

Definition

Mitigation means reducing the causes of climate change by lowering greenhouse gas emissions.

Methods with Examples

1. Renewable Energy

  • Solar panels in homes
  • Wind farms

2. Afforestation

  • Tree plantation drives

3. Sustainable Transport

  • Electric vehicles
  • Public transport
  • Solar rooftop systems in Surat homes
  • Electric buses introduced in Mumbai

8. Climate Change Management

Definition

Climate change management involves strategies, policies, and actions to reduce and adapt to climate change effects.

Components

1. Mitigation

Reducing emissions (renewable energy, energy efficiency)

2. Adaptation

Adjusting to climate effects

Examples of Adaptation

  • Flood control systems
  • Drought-resistant crops
  • Rainwater harvesting
  • Coastal protection projects in Kerala
  • Smart irrigation systems used by farmers in Punjab
  • Government awareness campaigns on climate change

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