This book has been lovingly created by the students of the partner schools of the eTwinning project “Let’s Learn Together, Let’s Grow Together.” Each school will continue the story by answering the guiding questions left for them and by letting their imagination bloom freely. Within these pages, young minds from different corners of the world come together with a shared dream: to imagine, to build, and to protect a cleaner, greener, more beautiful, and truly sustainable planet. Every paragraph written, every idea shared, and every hopeful vision added to this story carries a simple yet powerful message: When we learn together, we grow together — and when we act together, we can change the world.
Let this book be not only a story, but a journey.
A journey towards awareness, unity, creativity, and a brighter future for our Earth.
Contents
1. Welcome Message
2. About the Project: “Let’s Learn Together, Let’s Grow Together”
3. How to Use This Book
4. Özge Kirazlı's Team-Aysel Selahattin Erkasap Sosyal Bilimler Lisesi
5.Osman Kozluca's Team -Mürşide Ermumcu Trade Vocational and Technical Anatolian High School
6. Tetiana Tkach's Team- Kaharlyk lyceum №3
7. Perislava Bešić-Smlatic's Team- High school Ivana Lucića-Trogir, Croatia
8. Tuğba KARACA's Team - Samsun İbrahim Tanrıverdi Social Sciences High School
9. Sevgi Bayram's Team - Istanbul TOKI Kayasehir Vocational and Technical High School
10.Fatma Vardar's Team - Istanbul TOKI Kayasehir Vocational and Technical High School
11.Sare GÜNEŞ's Team-Giresun Atatürk Vocational and Technical Anatolian High School
12. Rabia YAKAR's Team- Niğde Yunus Emre Anadolu Lisesi
13. Ayse Kubra GUNEL - Cezeri Yeşil Teknoloji MTAL
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Contents
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Dear Readers,
Welcome to a unique journey created by the brilliant minds and warm hearts of our eTwinning project “Let’s Learn Together, Let’s Grow Together.” In this book, students from different schools, cultures, and backgrounds come together with one shared purpose: to imagine a better world.
We hope that as you turn each page, you will feel the excitement, curiosity, and creativity that guided every young author who contributed to this story. Let this book inspire you to learn, to dream, and to take care of our planet—together.
“Let’s Learn Together, Let’s Grow Together” is an international eTwinning collaboration that connects students across borders through creativity, teamwork, and shared environmental responsibility.
Our project encourages young learners to explore global issues, think critically, communicate effectively, and grow together as active citizens of the world.
By writing this book collectively, our students demonstrate that when we unite our minds and voices, we can imagine—and build—a brighter, greener future for everyone.
“Let’s Learn Together, Let’s Grow Together” is an international eTwinning collaboration that connects students across borders through creativity, teamwork, and shared environmental responsibility.
Our project encourages young learners to explore global issues, think critically, communicate effectively, and grow together as active citizens of the world.
By writing this book collectively, our students demonstrate that when we unite our minds and voices, we can imagine—and build—a brighter, greener future for everyone.
This book is designed as a collaborative storytelling adventure.
Each partner school reads the opening chapter and then continues the story by:
Answering the guiding questions provided,
Adding their own creative scenes, characters, or events,
Using their imagination to explore environmental themes,
Respecting the message of unity and sustainability.
Every school contributes one chapter, creating a beautiful chain of ideas that grows like a tree—rooted in cooperation and branching out through creativity.
The Day the Earth Whispered
One quiet morning, fourteen-year-old Lina noticed something unusual. The air felt heavy, and later that day she learned that the air pollution level in her town was 58 µg/m³, even though clean air should be below 25 µg/m³.
At the river near her home, the water looked grey and oily. Lina tested the water and found that the pH was 5.3, while a healthy river should be between 6.5 and 8.5. A small fish struggled near the shore, moving slowly.
As Lina walked toward the forest, she saw dry and withering trees. A sign explained that 3 hectares of forest are lost every year in the area, and she remembered that 1 hectare of forest can absorb about 6 tons of CO₂ per year.
Then the wind whispered softly:
“Help me…”
Lina realized that the Earth was speaking through these numbers. She took a deep breath and decided this was only the beginning of her journey.
Questions:
1. The river’s pH is 5.3, while the minimum healthy value is 6.5. How much lower is the river’s pH, and how does this result influence Lina’s first decision in the story?
2. The air pollution level is 58 µg/m³, and the safe limit is 25 µg/m³. By how much does it exceed the limit, and how does this information change what Lina decides to do next?
3. Each hectare of forest absorbs 6 tons of CO₂ per year, but 3 hectares are lost annually. How much CO₂ absorption is lost in one year, and how does this realization shape Lina’s plan for the future?
Özge Kirazlı's Team- ASE SBL İsmet-Berra-Ceylin-Damla-Reyhan- Eylül-Talha-Zeynep-Elif-Elif İ.-Fatma- Fatmagül- Medine
1- 6.5 − 5.3 = 1.2 pH units
This result indicates that the river is acidified and poses a threat to living organisms.
2- 58 − 25 = 33 mg/m³
This value indicates that the air poses a serious health risk.
3- 3 × 6 = 18 tonnes of CO₂
This means that 18 tonnes of carbon dioxide can no longer be absorbed each year.
Lina looked around carefully. The slow movements of the fish in the river, the leafless branches of the trees, and the haze in the sky made her feel that living beings were silently asking for help. She realized that these problems were not only environmental, but also biological processes that directly affect the lives of living organisms.
When she returned home, she opened her biology notebook. She read that acidified water could damage the gills of fish, polluted air could make photosynthesis more difficult for plants, and the destruction of forests could disturb the balance of ecosystems. She now understood better that every living being in nature is interconnected.
The next day at school, she talked with her friends. Together, they decided to examine the river water, observe the plant species in the area, and start a small tree-planting campaign. Lina was no longer just listening to the Earth’s whisper — she was responding to it.
1- If 3 hectares of forest are destroyed per year and 1 hectare of forest absorbs 6 tons of CO₂, how many tons of CO₂ absorption are lost annually in the ecosystem, and how does this affect biodiversity?
Saide Memtal, Engin Memtal, Aysenaz Memtal, Fatmanur Memtal, İrem Memtal, Şule Memtal, Yiğit Memtal, Sümeyye Memtal, Hatice Kübra Memtal
Teacher: Osman Kozluca
School:Mürşide Ermumcu Trade Vocational and Technical Anatolian High School
Tet
Tetiana Tkach/Kaharlyk lyceum №3/
Mariia.Titova-Yeva.Lytvynenko-Daria.Protsiuk-Yuliia.Kuravska-Taras.Katsiuba-Artem.Kliuiev-Marharyta.Zinchenko-Evanhelina.Hrebelnyk
After several weeks of hard work, they noticed small but significant changes for Lina and her friends. The rivers began to improve gradually. They put up warnings against littering, which helped raise awareness among the citizens. Lina’s grandmother gave her friends seedlings of various plants to plant, so they could bring color back to the environment.
While Lina was walking her dog Toby one spring evening, she heard the sound of flowers being torn and shouted, “Hey! Who’s there!?” As she approached the dark figure, tension filled the air. The dark figure’s face lit up in the streetlight. Lina froze.
Nina B., Valerija M., Marieta T.
Teacher: Perislava Bešić-Smlatić
High school Ivana Lucića-Trogir, Croatia
The person standing under the streetlight was holding a plastic bag filled with broken branches and flowers.
“Why are you doing this?” Lina asked carefully.
The boy hesitated. “I… I just wanted to make decorations for a party,” he said quietly.
Lina looked at the crushed flowers and sighed. She remembered what she had learned — every small action could affect nature more than people realized.
The next day at school, Lina and her friends decided to investigate something new.
They asked:
How much waste is produced in our neighborhood every week, and how much of it could be recycled instead of harming nature?
To find out, they collected data from 10 houses nearby. After counting and weighing the waste, they recorded:
Lina opened her notebook.
“If 48 kg out of 120 kg can be recycled,” she said, “What percentage is that?”
Her friend Maya calculated:
(48÷120)×100=40%
"Forty percent!" she said. “That means almost half of the waste doesn’t need to go to landfill.”
Lina explained:
“When recyclable waste is burned or buried, it increases carbon emissions and pollutes soil and water. But if we recycle it, we reduce energy use and protect habitats.”
Tuğba KARACA' s Team-SSBL- Ali Talha SSBL, Berru SSBL, Duru SSBL, Ecrin SSBL, İrem SSBL, Kübra SSBL Melek Sultan SSBL, Ömer Faruk SSBL, Zeynep SSBL, Zümra SSBL
If the town could recycle more waste, what changes might they see in nature?
Maya closed her notebook slowly.
For a moment, none of them spoke.
“If forty percent can be recycled,” Lina said thoughtfully, “then almost half of our problem already has a solution.”
The group decided not to stop at numbers.
They asked another question:
If our neighborhood produces 120 kg of waste per week, how much waste is that in one year?
Maya calculated:
120 kg × 52 weeks = 6,240 kg per year.
“Over six tons,” she whispered. “From just ten houses.”
Then Lina asked:
“If 40% of that is recyclable, how much could we save from landfill in a year?”
They calculated again:
6,240 kg × 40% = 2,496 kg.
“That’s nearly two and a half tons of waste we could recycle instead of burying,” said Daniel.
The next part was more difficult.
“What happens if we don’t recycle it?” Lina asked.
They researched together.
When waste is burned, carbon dioxide is released.
Plastics can take hundreds of years to break down in nature.
When glass and metal are thrown away, new raw materials must be extracted; this harms forests, rivers, and ecosystems.
Lina made two simple drawings in her notebook.
In the first drawing, smoke was rising from a landfill. The nearby river looked gray. Very few birds were flying.
In the second drawing, recycling bins stood next to clean streets. The trees were greener. Butterflies were flying over the flowers. The air looked cleaner.
Maya gently asked, “So, what changes would we see in nature if our town recycled more waste?” Daniel answered first.
“Cleaner air,” he said. “Less smoke.”
“Healthier soil,” said Lina. “Fewer harmful chemicals leaking into the ground.”
“More animals returning,” Maya added. “Because habitats wouldn’t be destroyed for new materials.”
They continued imagining measurable changes:
Lower carbon emissions
Less energy used in production
Cleaner rivers
Reduced landfill size
More green spaces instead of dumping areas
The next day, they presented their findings at school.
They didn’t accuse anyone.
They simply showed the numbers.
They showed what 2,496 kilograms looked like in pictures.
They showed what forty percent really meant.
And then Lina said:
“Small actions are never really small when multiplied by a whole town.”
By the end of the week, the school placed labeled recycling containers in every corridor. The students created posters explaining the math behind their message. Even the boy from under the streetlight joined them — this time holding a box for collecting paper waste.
Action protects our future.
Motto: Measure. Understand. Act. Protect.
Because they had learned something important:
Understanding leads to responsibility. Responsibility leads to action.
Sevgi Bayram's Team - Istanbul TOKI Kayasehir Vocational and Technical High School
-Melek B. -Nehir I. -Sinan K. -Mazrum B. -Rumeysa B.
The recycling bins filled faster than anyone expected.
But Lina wasn’t satisfied yet.
“We measured waste,” she said. “Now we should measure change.”
So the group created a new investigation:
How much did recycling reduce our neighborhood’s carbon footprint in one month?
They searched for reliable data and found that recycling 1 kilogram of mixed recyclable materials can prevent approximately 1.5 kilograms of CO₂ emissions compared to landfill or burning.
They collected data again after four weeks.
Total recyclable waste properly separated that month: 210 kg
Maya quickly calculated:
210 kg × 1.5 kg CO₂ = 315 kg CO₂ prevented
“That means,” Daniel said, “we stopped 315 kilograms of carbon dioxide from entering the atmosphere in just one month.”
Lina smiled.
“And if we keep doing this for a year?”
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