Learning Objectives

• By the end of this lesson, you will be able to:

• Define the Greenhouse Effect and explain its role in regulating Earth's temperature.

• Identify the major greenhouse gases and their sources.

• Explain how human activities have enhanced the greenhouse effect.

Key Vocabulary

Greenhouse Effect

The process of warming the atmosphere by trapping heat radiating from Earth's surface.

Greenhouse Gas

Gases in the atmosphere that absorb and radiate heat to warm the planet, like carbon dioxide.

Carbon Dioxide (CO₂)

A key greenhouse gas released by natural processes and human activities like burning fossil fuels.

Methane (CH₄)

A powerful greenhouse gas that has become 2.5 times more common due to human actions.

What is the Greenhouse Effect?

• The greenhouse effect is a natural process that warms the Earth, making it habitable.

• It acts as a form of insulation for the planet, trapping the sun's energy.

• The atmosphere allows sunlight to enter but prevents some heat from escaping.

• This keeps Earth at an average temperature of 14°C, warm enough for life.

The Greenhouse Mechanism

• Solar radiation from the Sun travels to the Earth's surface.

• The Earth's surface absorbs this energy and heats up.

• Greenhouse gases trap some of the heat radiated from the surface.

Important Greenhouse Gases

• Primary greenhouse gases include carbon dioxide (CO₂) and water vapor (H₂O).

• Others are methane (CH₄), ozone (O₃), nitrous oxides (NO, NO₂), and CFCs.

• Human activities like burning fossil fuels have significantly increased the concentration of these gases.

• Atmospheric CO₂ has risen by over 35%, and methane has increased 2.5 times.

Common Misconceptions

Summary

• The Greenhouse Effect is a natural process where atmospheric gases trap heat, keeping Earth warm.

• Solar radiation heats the Earth, which then radiates heat that is trapped by greenhouse gases.

• Key greenhouse gases include carbon dioxide (CO₂), methane (CH₄), and water vapor (H₂O).

• Increased greenhouse gases from human activities enhance this effect, causing climate change.