(214) SIA STEM 4: Planet Protectors

Introduction to Climate Change

Definition: Climate change refers to significant long-term alterations in weather patterns and average temperatures on Earth, primarily attributed to human activities.

Examples of Change:

  • Increased Extreme Weather Events: There has been a notable rise in extreme weather incidents, such as flooding, hurricanes, heatwaves, and powerful storms. These events disrupt ecosystems and threaten human life and infrastructure.

  • Drought Conditions: Prolonged droughts are occurring more frequently, affecting agricultural outputs, water supply, and increasing the risk of wildfires.

Consequences: Global warming affects all life on the planet adversely, leading to:

  • Rising Sea Levels: Melting polar ice caps contribute to rising sea levels, threatening coastal communities.

  • Biodiversity Loss: Species extinction rates are accelerating due to changing habitats and climate conditions.

  • Health Impacts: Increased incidence of respiratory issues and heat-related illnesses linked to climate change.

Causes of Climate Change

Greenhouse Effect:

  • Greenhouse gases, particularly carbon dioxide (CO2) and methane (CH4), are increasing due to human activities such as fossil fuel combustion, deforestation, and industrial processes.

  • These gases trap heat in the atmosphere, creating a 'blanket' effect that leads to rising global temperatures and disrupts weather patterns.

Net Zero Initiatives:

  • Scientists and STEM professionals are actively working to control greenhouse gas emissions to achieve "Net Zero." This means balancing the amount of greenhouse gas produced with the amount removed from the atmosphere through methods such as carbon capture and storage, reforestation, and improved energy efficiency.

Electricity Generation and Its Impact

Power Stations:

  • Cooling Towers: Commonly misidentified as emitting smoke; however, they primarily release water vapor. Understanding this distinction is crucial when discussing the environmental impact of power plants.

Electricity Generation Process:

  • The production of electricity typically involves heating water to create steam, which then turns turbines.

  • Traditional fuels like coal, oil, and natural gas contribute significantly to greenhouse emissions, posing environmental threats and accelerating climate change.

  • Alternative Methods: Nuclear fission is used to produce cleaner energy with minimal greenhouse gas emissions, while solar and hydro energy are also viable sustainable options.

Wind Energy as a Solution:

  • Wind turbines represent a key component of renewable energy strategies, generating electricity without emitting greenhouse gases, thus contributing to climate change mitigation.

Hands-On Activity: Creating Wind Turbines

Materials Needed:

  • Templates, quarter straws, wooden skewers, masking tape, blue tack, scissors, and pens/pencils.

Steps to Create Wind Turbines:

  1. Design and Cut Blades:

    • Students should cut the template and design on both sides for improved aerodynamics.

    • Carefully create holes at designated blue dots using a skewer and blue tack to attach the blades securely.

  2. Form the Turbine:

    • Snip lines to create blade shapes tailored to maximize wind capture.

  3. Building the Structure:

    • Use skewers and straws to create a stable T-shape for the turbine tower.

    • Connect all parts with masking tape, ensuring the straw openings remain unobstructed to allow for airflow.

  4. Final Assembly:

    • Assemble the turbine blades onto the tower, ensuring it’s strong and secure to withstand various wind conditions.

Encouragement for Collaboration:

  • Students should be encouraged to assist each other in their designs and problem-solving, fostering an environment where curiosity, creativity, and courage can flourish throughout the activity.