Global Warming or Green House Effect – Causes, effect & control

Q: What is Global Warming or Green House Effect? Explain its effect and controlling measures.

Global Warming / Greenhouse Effect

Global Warming refers to the long-term increase in Earth’s average surface temperature due to minimal natural and but maximally manmade activities, particularly the release of greenhouse gases (GHGs) CO2, CH4, water vapour, O3, N2O etc. into the atmosphere. These gases trap heat, causing a “greenhouse effect” that leads to a gradual increase in the earth’s surface temperature. The green effect is named according to the same phenomenon that happens in green houses which the plastic roof traps the sunlight and retains and keeps the greenhouse the temperature humidity, and light suitable for plant growth. Yet, CH₄ is 23 times more effective and N₂O is 296 times more effective than CO₂. However, there is much more CO₂ in the Earth’s atmosphere than there is CH₄ or N₂O.

Global warming is a central aspect of climate change, which encompasses not just warming temperatures but also a variety of shifting weather patterns, rising sea levels, and changes in an ecosystem with loss of biodiversity and Threats to Agriculture and Food Security.

                                     Sunlight reversion towards the earth

1. Greenhouse Gas Emissions:

• Carbon Dioxide (CO₂): The largest contributor to global warming, primarily from burning fossil fuels (coal, oil, and natural gas) for energy, transportation, and industrial processes for releasing CO₂.

  

• Methane (CH₄): Released during agricultural activities, digestive system of livestock (microorganisms living in ruminants), and from natural gas production. Methane is significantly more potent as a greenhouse gas than CO₂ in the short term.
• Nitrous Oxide (N₂O): Emitted from agricultural activities, particularly from fertilizers and the management of animal waste, as well as from industrial processes.
• Fluorinated Gases: A group of synthetic gases used in industrial, refrigerant, and air conditioning applications (Chloro fluoro carbons (CFCs). These gases, though emitted in smaller quantities, have a very high global warming potential.
•  

• Key Causes of Global Warming:

• Burning of Fossil Fuels

  • The combustion of coal, oil, and natural gas for energy and transportation releases large quantities of carbon dioxide (CO₂) and other greenhouse gases (GHGs).

  Deforestation

  • Trees absorb CO₂, so cutting down forests reduces Earth’s ability to remove CO₂ from the atmosphere.

  Agriculture

  • Livestock (e.g., cows) produce methane (CH4) during digestion.
  • Agricultural practices, like rice cultivation and the use of synthetic fertilizers, release methane and nitrous oxide.

  Industrial Processes

  • Manufacturing, mining, and construction release GHGs like CO₂ and fluorinated gases (e.g., hydrofluorocarbons).

  Waste Management

  • Decomposing organic waste in landfills produces methane.

2. Land Use Changes: In addition to deforestation, urbanization and the draining of wetlands can contribute to global warming by reducing the natural land-based carbon insulation processes

Effects of Global Warming:

1. Rising Temperatures:

• Global temperatures have already risen by approximately 1.2°C (2.2°F) since the late 19th century, with most of this warming occurring in recent decades.
• Increased temperatures lead to more frequent and intense heat waves, particularly in regions that are already warm or arid.

  

2. Melting Ice and Rising Sea Levels:

• Warming temperatures are causing the polar ice caps and glaciers to melt, contributing to rising sea levels. Melting ice sheets in Greenland and Antarctica are significant contributors.
• As sea levels rise, coastal cities, low-lying islands, and river deltas are at risk of flooding, displacing millions of people.

3. Extreme Weather Events:

• Increased global temperatures contribute to more frequent and intense storms, hurricanes, and typhoons. Warmer air holds more moisture, leading to more powerful storms and heavy rainfall events.
• Droughts are becoming more severe in many parts of the world, reducing water availability for agriculture, drinking, and hydropower.

4. Threats to Agriculture and Food Security:

• Changing weather patterns, including shifts in rainfall and temperature, have direct impacts on crop yields and food production. Some regions may face reduced productivity due to droughts or heat stress, while others may face flooding or pest infestations.
• These disruptions to food production may lead to price increases and food shortages, particularly in vulnerable regions.

5. Health Risks:

• Warming temperatures contribute to the spread of vector-borne diseases like malaria and dengue fever, as mosquitoes thrive in warmer climates.
• Heat stress, respiratory problems (due to poor air quality), and water-borne diseases (due to flooding and inadequate sanitation) can have significant health impacts, particularly in poorer, densely populated areas.

Mitigation and Adaptation Strategies:

Mitigation (Reducing the Causes):

1. Renewable Energy: Transitioning from fossil fuels to renewable energy sources like wind, solar, hydro, and geothermal can reduce greenhouse gas emissions.
2. Energy Efficiency: Improving energy efficiency in buildings, transportation, and industrial processes reduces energy consumption and emissions.
3. Carbon Capture and Storage (CCS): Technologies that capture CO₂ emissions at the source (e.g., power plants) and store them underground or use them for other purposes (such as in the production of synthetic fuels) are being developed.
4. Afforestation and Reforestation: Planting trees and restoring forests can increase carbon sequestration and restore ecosystems.
5. Sustainable Agriculture: Practices such as reduced tillage, cover cropping, and agroforestry can reduce emissions from agriculture while improving soil health.
6. Transition to a Circular Economy: Reducing waste and increasing recycling and reuse can minimize emissions associated with manufacturing, mining, and waste disposal.