Introduction: Climate Sensitivity Classes: Reclaiming the Lost Landscapes of Life

Chapter 1: Nature is constantly signaling a crisis.

What is climate change?
A warning from spring flowers that defy time
Why we can't welcome early flowering
If bees disappear, the ecosystem will collapse.
The future of Earth engulfed in flames
The Earth has a deadly flu
The intense heat is just beginning.
The Secret of the Disaster Movie-Like Downpour
The red autumn leaves began to turn green.
Tears of the snowy field longing for the cold snow
Heavy snow, the counterattack of a heated Earth

Chapter 2: How Climate Change Changes the World

Climate inflation threatens the national and household economy.
How urban climate change is impacting cities.
The relentless scourge of climate change
The pandemic isn't over
Climate change is changing fashion trends.
Climate pandemic that will bring about social disaster
The climate crisis is sparking another war.
The Earth's breathing is accelerating
Carbon time passes terrifyingly quickly.
The damage from the climate crisis is not fair.

Chapter 3: Stopping the Climate Change Clock

Children must live in the world we leave behind.
A new culture is needed to navigate the era of extreme climates.
Climate change is a present threat, not a distant future threat.
Protecting our cultural heritage can change climate history.
Desert nations dream of a forest miracle.
Technology can change the reality of climate change.
Five Climate Tech Tips to Save the Planet
If we can't prevent climate disasters, let's reduce their damage.
Climate technology is a long-term survival strategy.
Is AI an enemy or a hero in the age of climate crisis?
Why New York Banned Gas Stoves
If we ignore the climate crisis, the Earth has no future.

"Winter, which should be covered in white snow, is burning red."
From the disappearing seasonal scenery to our crumbling daily lives.
Nature's signals of crisis and humanity's response to survival

"The Last Chance to Change the Ending of the Climate Scenario"
The first environmental essay written from the perspective of 'climate sensitivity'

“Climate change is the greatest hoax ever perpetrated on the world,” “If you don’t get out of this green hoax, your country will fail.” These were the words of US President Donald Trump, who denied climate change in his speech at the United Nations General Assembly.
Contrary to his claims, if we fail to overcome climate change now, the future of the entire world will be bleak.
Even without accessing the vast scientific evidence, we can guess the severity of climate change by looking at increasingly severe climate phenomena such as heat waves, cold waves, heavy rains, and large-scale wildfires.
So what does the future hold for humanity? Is the end of the world truly imminent? It would be better if, like in a typical disaster movie, a catastrophe suddenly struck and humanity was wiped out in an instant.
The reality that climate change will bring is different.
Climate disasters do not occur suddenly and simultaneously everywhere, but rather work by gradually tightening our leashes in various aspects of our daily lives.

This book shows how climate change is permeating our daily lives through various signals and discusses how we can respond to prevent the situation from worsening.
Professor Jeong Su-jong of Seoul National University, a climate scientist and rising environmental writer, discusses our current reality and response strategies from the perspective of "climate sensitivity," which sensitively captures everyday climate issues.
From natural changes like earlier blooming of spring flowers and falling green leaves to the crises we face like rising prices, epidemics, and climate refugees, we explore how climate change is shaking the world.
Furthermore, we introduce ways to prevent the worst-case climate scenario, including feasible measures such as climate technology and climate policy.


“Endless summer, green leaves, snow-covered spring flowers…”
Nature's Signals of Crisis and the Perpetrators of Climate Change

We can now capture scenes of climate change everywhere in our daily lives.
Flowers bloom before spring even arrives, and even though we're on the threshold of autumn, the heat shows no signs of ending. In one place, torrential rain pours down, while the next area sighs under drought, green leaves fall, and snow covers the cherry blossoms. This strange sight continues.
Chapter 1 presents a bleak picture of climate change as it appears in the natural world and examines its causes.
In particular, it emphasizes that these abnormal symptoms are not limited to individual problems, but can be linked like a chain and lead to other problems.
Earlier flowering times are a threat to biodiversity, hotter, drier climates mean more frequent wildfires, heat waves are causing food crises, and melting snow from warming is causing more warming.
This is the reality we face as we ignore the signals of crisis sent by nature.
Although the Earth's climate has changed throughout history, climate change is considered a serious problem today because the changes are so rapid and intense.
So what is the cause of such severe climate change? This book points to humans as the culprit.
The most important factor in climate change is greenhouse gases, and humans have exacerbated climate change through excessive greenhouse gas emissions.
Ultimately, it points out that the carbon emitted in the various processes of eating, drinking, living, producing, and enjoying ourselves is destroying our land.

“The Earth did not promise us a tomorrow like today.”
Climate disasters threaten not only food, clothing, shelter, and the economy, but also national security.

Climate change will change not only the natural world but also our lives.
“Changes in meteorological factors such as temperature, precipitation, and wind ultimately have a huge impact on various fields directly related to our lives.” (p. 102) Chapter 2 introduces how climate change is changing cities, society, and civilization in areas such as daily life, medicine, politics, economy, and security.
First, we will learn about "climate inflation," which is a phenomenon in which climate change damages sectors such as raw materials and supply chains, leading to rising prices.
Through domestic and international examples, we convey that climate change can have a direct impact not only on our own country but also on distant countries.
They also warn that complex disasters, such as torrential rains and heat waves, will become more unpredictable and frequent in the future, and that they could threaten not only crop damage but also the market economy and individual pocketbooks.


Climate change could recreate nightmares like the COVID-19 pandemic.
As the climate rises, the habitats of mosquitoes, which are vectors of infectious diseases, are expanding, increasing the risk of infectious diseases and epidemics. In addition, as the permafrost in polar regions melts, there is also the possibility that frozen viruses will escape into the atmosphere.
It also points out that socioeconomic instability in countries vulnerable to climate disasters could become a political and security issue between nations.
The problem becomes even more complex when climate change is coupled with demographic changes such as an aging population.
Older people, who have a reduced ability to regulate their body temperature and have difficulty recognizing warning signs of heat, are at greater risk from heat waves.
Another dark reality is that the impact of the climate crisis is not shared equally by everyone.
The extent of damage will inevitably vary depending on economic power, residential area, infrastructure, and country.
Amidst this climate inequality, we examine the potential disasters climate change poses to our lives, from the loss of our homes and the risk of climate refugees to international conflict.

“Only humans can restore the climate we have destroyed.”
A culture needed in the era of extreme climate change and realistic measures to cope with the crisis.

So what should we do? Chapter 3 discusses the mindset everyone should have as we navigate the era of extreme climate change, as well as practical measures at the societal level.
This book suggests that in order to respond to climate change, we must first change our culture.
The reason the climate is changing is because culture, that is, the way humans live, is changing, and to turn the climate around, we need changes in our lifestyles, including politics, economics, law, morality, and technology.
In this context, we present methods that are being attempted or are feasible at the government and corporate levels, beyond simply improving individual member awareness.
It provides a new perspective on solving climate problems by focusing on the palace city forest that absorbs carbon and preserves biodiversity.
Furthermore, it delivers a message of hope that the technologies that destroyed the climate can also save it, and introduces climate technologies that respond to the climate crisis.


We explore climate tech sectors that are saving the planet, including "cleantech" that replaces fossil fuels, "carbontech" that eliminates or utilizes carbon, and "ecotech" that reduces resource waste.
In addition, we discuss climate measures from a more macroscopic perspective, such as so-called "climate risk hedging" strategies to minimize the damage caused by climate change, "patient capital" that invests in long-term climate technology, climate finance that mitigates the impact of the climate crisis, and the use of artificial intelligence in the era of the climate crisis.
Now, old sayings like ‘the Earth is sick’ and ‘let’s protect the environment’ can no longer move people.
We must recognize the signs of climate change that are permeating every corner of our lives and begin taking action immediately to protect our present.