Climate change

Learning Outcomes and Performance Indicators

  • Define climate change.

  • Identify the various causes of climate change.

  • Explain how climate change interacts with society.

  • Discuss effective methods for mitigating the impacts of climate change.

Topic Outline

  1. Climate change

  2. Natural causes of climate change

  3. Anthropogenic causes of climate change

  4. The impact of climate change on human society

  5. Environmental awareness and conservation strategies

Climate Change

  • Definition: Long-term shifts in temperatures and weather patterns.

  • Impact: Climate change has severely affected the natural environment and human society. Severe consequences will persist without proactive measures.

  • Global Efforts: Initiatives focus on reducing carbon emissions. Individual contributions are crucial for environmental protection.

Natural Causes of Climate Change

  1. Volcanic Eruptions:

    • Emit carbon dioxide and other gases, including sulfur dioxide.

    • Release aerosols (e.g., volcanic ash) that can cool the Earth by blocking sunlight for 1-2 years.

  2. Orbital Changes (Milankovitch Theory):

    • Changes in Earth's orbit affect solar energy received, influencing climate.

    • Three factors:

      • Eccentricity (shape of orbit)

      • Obliquity (tilt of axis)

      • Precession (wobble of axis)

  3. Plate Tectonics:

    • Movement of tectonic plates alters the position of continents and affects climate by influencing ocean currents and air circulation.

  4. Variation in Solar Radiation:

    • Correlation with sunspot activity affects Earth's temperature.

    • More sunspots may lead to warmer climates, fewer may result in cooler periods.

Anthropogenic Causes of Climate Change

  1. Greenhouse Gas Emissions:

    • The natural greenhouse effect is exacerbated by human activities.

    • Key gases include:

      • Carbon dioxide (CO2)

      • Methane (CH4)

      • Nitrous oxide (NO2)

      • Chlorofluorocarbons (CFCs)

    • Excess greenhouse gases trap heat, leading to global warming.

  2. Deforestation:

    • Plants store carbon; deforestation releases this carbon, increasing atmospheric CO2.

    • Major contributors include logging and land conversion for agriculture.

  3. Urbanization (Evaporation):

    • Urban areas are warmer due to reduced evaporation and increased heat absorption from buildings.

    • Loss of natural water bodies hampers cooling evaporation.

  4. Ozone Depletion:

    • Caused by chemicals like nitrogen oxides and CFCs.

    • Reduces the ozone layer's ability to block harmful UV rays, increasing health risks for humans.

Climate Change and Human Society

  • Impact Areas: Water resources, forestry, agriculture, coastal areas, and public health.

    1. Water Resources:

      • Reduced rainfall leads to water scarcity, affecting agriculture and energy production.

      • Intense rainfall can cause floods, mudslides, and infrastructure damage.

    2. Forestry:

      • Forests face degradation; indigenous communities require alternative livelihoods.

    3. Agriculture:

      • Rising temperatures can decrease crop yields and create favorable conditions for diseases.

      • Research is essential for adapting to changing conditions.

    4. Coastal Resources:

      • Rising sea levels and extreme weather affect livelihoods in coastal regions.

    5. Health:

      • Increased diseases and health issues from extreme weather events and changing ecosystems.

      • Food security is compromised, leading to malnutrition.

Environmental Awareness and Conservation

  • Main Issue: Increasing CO2 levels primarily from fossil fuel combustion.

  • Solutions:

    • Transition to renewable energy sources (solar, wind, hydro).

    • Enhance energy efficiency in households (insulation, energy-efficient appliances).

    • Promote water conservation and use LEDs to reduce electricity use.

    • Use fuel-efficient vehicles to lower fossil fuel consumption.

  • Collective Action: Local and global collaboration is needed to effectively combat climate change.

International Agreements

  1. Kyoto Protocol:

    • An international agreement aimed at binding emission reductions; signed by the Philippines.

    • Initially adopted in 1997, binding commitments started from 2008-2012.

    • Developed countries aimed for a 2% reduction in CO2 emissions by 2050.

  2. Montreal Protocol:

    • Aimed at phasing out substances that deplete the ozone layer.

    • Signed by 197 countries, including the Philippines.

Mitigation Measures in the Philippines

  • Various adaptation projects underway to increase resilience to climate change, including:

    • Millennium Development Goals Fund for strengthening institutional capacity.

    • Philippine Climate Change Adaptation Project focusing on resilience in agriculture and resources.

    • National Framework Strategy on Climate Change to develop community adaptation capacity.

  • Conclusion: Collective efforts and innovative strategies are vital for combating climate change and fostering a resilient society.