Objectives (5 - 7 minutes)

Main Objectives:

1. Understand the concept of the greenhouse effect, its causes and consequences, and how human actions can contribute to its worsening.
2. Recognize the importance of the balance between greenhouse gases and the impact of the imbalance in this process.
3. Identify the main human activities that contribute to the increase in greenhouse gases.

Secondary Objectives:

1. Stimulate critical reflection on the role of each individual in mitigating the greenhouse effect.
2. Promote the understanding that small daily actions can have a significant impact on reducing the greenhouse effect.
3. Encourage research and individual study as tools for continuous learning about global environmental issues.

Introduction (10 - 15 minutes)

1. Review of Previous Content: The teacher starts the lesson by reviewing the concepts of atmosphere, solar radiation, and the importance of the greenhouse effect for the maintenance of life on Earth. For example, the teacher may ask students to recount these concepts in their own words. (3 - 5 minutes)

2. Problem Situation: The teacher proposes two problem situations to arouse students' interest and introduce the theme of the lesson:

   • First situation: "Imagine that the ozone layer, which protects us from ultraviolet rays, was completely destroyed. What do you think would happen to the temperature on Earth?"
   • Second situation: "And if the entire Amazon rainforest, which acts as a large CO2 filter, were burned? How would this affect the amount of CO2 in the atmosphere and the planet's temperature?" (5 - 7 minutes)

3. Contextualization: The teacher emphasizes the relevance of the theme, explaining that the greenhouse effect and human action are global issues that affect everyone, not only nature but also the economy, health, food security, among other aspects. For example, the teacher may mention recent news about natural disasters, such as hurricanes and droughts, which are intensified by the greenhouse effect, to illustrate how understanding this phenomenon is crucial for decision-making and actions in the present and future. (2 - 3 minutes)

4. Capturing Students' Attention: The teacher presents curiosities and interesting facts about the theme. Some suggestions are:

   • Curiosity 1: "Did you know that the greenhouse effect is not a bad phenomenon in itself? In fact, it is essential for life on Earth, as without it the average temperature of the planet would be -18ºC, making life as we know it impossible."
   • Curiosity 2: "Have you heard of the 'artificial greenhouse effect'? It is caused by human action and occurs when the concentration of greenhouse gases in the atmosphere increases rapidly, leading to a more intense and rapid global warming than the natural one." (3 - 5 minutes)

Development (20 - 25 minutes)

1. Activity 1: 'The CO2 Journey' (10 - 12 minutes)

   • Class Division: The teacher divides the class into groups of 4 to 5 students.
   • Contextualization: The teacher explains that CO2 (carbon dioxide) is one of the main greenhouse gases produced by human activities, and that it spreads through the atmosphere, contributing to global warming.
   • Activity Description: The teacher hands out a different scenario card to each group involving CO2 production. Scenarios may include things like 'A family that uses cars for everything', 'A coal plant', 'A factory that produces plastic on a large scale', among others. The objective of the activity is for each group to trace the 'CO2 Journey' in these scenarios, from production to release into the atmosphere.
   • Activity Development: Students, in their groups, discuss and draw the CO2 journey in their scenarios, identifying the stages where CO2 is produced, how it is released, and the possible impacts of this on the greenhouse effect. They are also encouraged to think of possible solutions to reduce or mitigate CO2 production in these scenarios.
   • Sharing and Discussion: After completing the activity, each group presents its 'CO2 Journey' to the class, and all students are invited to ask questions and make comments.

2. Activity 2: 'The Planet in Balance' (10 - 12 minutes)

   • Contextualization: The teacher explains that to understand the greenhouse effect, it is important to understand the concept of balance. In nature, there are processes that help maintain the balance of greenhouse gases in the atmosphere. An example is photosynthesis, which absorbs CO2 and releases oxygen.
   • Activity Description: The teacher hands out a table to each group with the amount of CO2 produced and absorbed by different human activities and natural processes. The objective of the activity is for students to identify the human activities that contribute the most to CO2 production and the natural processes that absorb the most, and reflect on what this means for the balance of the greenhouse effect.
   • Activity Development: Students, in their groups, analyze the table, calculate the difference between the production and absorption of CO2 in each scenario, and discuss their observations. They are encouraged to think of possible ways to increase CO2 absorption and/or reduce its production.
   • Sharing and Discussion: After completing the activity, each group shares their observations with the class, and all students are invited to ask questions and make comments.

3. Activity 3: 'Action for Change' (5 - 7 minutes)

   • Contextualization: The teacher reinforces the idea that small actions can make a difference. He explains that although the greenhouse effect problem is global and complex, each of us can contribute to the solution through our choices and daily actions.
   • Activity Description: The teacher hands out a large sheet of paper and colored pens to each group. The objective of the activity is for students, in a creative and collaborative way, to draw an 'action map' with ideas on how they and their families, schools, and communities can contribute to reducing the greenhouse effect.
   • Activity Development: Students, in their groups, discuss and draw the ideas on the action map. They are encouraged to think of concrete and realistic actions, such as 'using the car less and opting for sustainable transportation', 'recycling and reusing more', 'planting trees', among others.
   • Sharing and Discussion: After completing the activity, each group shares their action map with the class, and all students are invited to ask questions and make comments. The teacher concludes the activity by emphasizing the importance of cooperation and collective action to address the challenge of the greenhouse effect.

Return (8 - 10 minutes)

1. Group Discussion (3 - 4 minutes): The teacher organizes a group discussion with all students, where each group has up to 3 minutes to share the solutions or conclusions they found in their respective activities. During this discussion, the teacher should encourage students to ask questions and exchange ideas with each other. The goal is for students to be exposed to different perspectives and solutions to the greenhouse effect problem, and to realize that collective action is essential to address this challenge.

2. Connection with Theory (2 - 3 minutes): After the discussion, the teacher makes the connection between the practical activities carried out and the theoretical concepts discussed in the Introduction of the lesson. The teacher highlights how the activities help illustrate the functioning of the greenhouse effect, the importance of the balance of greenhouse gases, and how human action can contribute to exacerbating or mitigating this phenomenon.

3. Individual Reflection (2 - 3 minutes): The teacher proposes that students silently reflect on the answers to the following questions:

   • 'What was the most important concept you learned today?'
   • 'What questions have not been answered yet?'
   • 'How can you apply what you learned today in your daily life to contribute to reducing the greenhouse effect?'

4. Sharing Reflections (1 minute): After the reflection period, the teacher invites some students to share their answers with the class. The teacher should value all answers, even if they are different or divergent, and reinforce the importance of reflection and continuous learning.

5. Feedback (1 minute): Finally, the teacher asks for quick feedback from the students about the lesson. For example, the teacher may ask: 'What did you find most interesting in today's lesson?' and 'What could be improved for the next lessons?'. Student feedback is a valuable tool for the teacher to assess the effectiveness of their teaching strategies and make necessary adjustments to the planning of future lessons.

Conclusion (5 - 7 minutes)

1. Recapitulation (2 - 3 minutes): The teacher recaps the main points covered during the lesson, reinforcing the concepts of the greenhouse effect, the importance of the balance of greenhouse gases, and how human action can exacerbate or mitigate this phenomenon. The teacher also recalls the main conclusions and solutions presented by students during the practical activities, highlighting the importance of collective engagement in the fight against the greenhouse effect.

2. Connection of Theory with Practice (1 - 2 minutes): The teacher emphasizes how the practical activities carried out during the lesson helped illustrate and reinforce the theoretical concepts presented. For example, the teacher may highlight how the 'CO2 Journey' activity allowed students to concretely visualize the path of CO2 in the atmosphere, and how the 'Planet in Balance' activity demonstrated the importance of the balance between CO2 production and absorption.

3. Extra Materials (1 minute): The teacher suggests extra materials for students who wish to deepen their knowledge about the greenhouse effect and human action. These materials may include books, documentaries, websites of environmental organizations, among others. For example, the teacher may recommend the documentary 'An Inconvenient Truth' by Al Gore, which explores in a didactic and impactful way the causes and consequences of global warming.

4. Practical Applications (1 - 2 minutes): Finally, the teacher highlights the importance of the theme for students' daily lives. The teacher reinforces that although the greenhouse effect is a global phenomenon, individual action is essential for its mitigation. For example, the teacher may suggest some simple actions that students can adopt in their daily lives to contribute to reducing the greenhouse effect, such as saving energy, recycling, reducing meat consumption, among others. The teacher concludes the lesson by emphasizing that through knowledge and action, each of us can make a difference in the fight against the greenhouse effect.