Module 1 | Understand: Climate Change
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Module 1

Understand: Climate Change

Introduction: This module provides you with key information about the causes of climate change, the impact it is having globally, and the responses needed to address the climate crisis.

Climate change is one of the greatest threats and injustices of our time. It threatens the existence of all humans and living things. While climate change affects everyone, it does not affect everyone equally. There is so much to learn about climate change. This module provides you with key information about the causes of climate change, the impact it is having globally, and the responses needed to address the climate crisis. It sets the scene for the subsequent modules in this toolkit.

What will I learn in this module?

By the end of the module, you will:

  • Have gained an understanding of what causes climate change. 
  • Understand and be able to explain the impacts of climate change globally. 
  • Know what responses are needed to address the climate crisis.

The below infographic provides a summary of the key content in this module:

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Warm Up

For those seeking in-depth studies, academic writing and guidance to take your understanding further.

The difference between weather and climate

Earth is getting hotter, largely because of human activities like burning coal, oil and gas. As temperatures rise, the climate is changing. While many people think climate change mainly means warmer temperatures, it’s much more than that. The Earth is a system, where everything is connected. A warming planet has consequences that reach across the globe, including intense droughts, water scarcity, catastrophic storms and severe flooding. 

To understand climate change, it’s important to distinguish between weather and climate.  

Weather involves short-term changes. If it’s raining on Friday morning but the sun is out by lunchtime – that’s a change in the weather. In technical terms, weather is the atmospheric conditions experienced over short periods of time (such as hours or days) at a particular location. 

Climate involves long-term changes. If an older person tells you that 40 years ago there was a lot more rain in a particular month where they live than today, they could be talking about a change in climate. Climate is how the atmosphere “behaves” over longer periods of time (an average of the past 30 years), which in turn affects how the rest of the climate system behaves.

Climate change refers to the long-term changes in the Earth’s climate. It causes weather patterns to be less predictable, affecting the balance of Earth’s precious ecosystems. These changes persist for long periods of time, typically decades or more. 

Climate change can be due to natural processes, such as changes in how much energy the sun produces and volcanic eruptions. However, humans are changing the climate by pumping heat-trapping gases from burning fossil fuels into the atmosphere. This is called human-induced or anthropogenic climate change. This impact has been so big, and the consequences so dire, that organizations like the United Nations say we are facing a “climate emergency.”


The greenhouse effect: making our planet a livable home

Life on Earth is an incredible thing. And it’s made possible by the interplay between two key elements: the Sun, which produces heat from 150 million kilometers away, and our atmosphere, the band of air around our planet.  

The atmosphere contains several gases. Together, the oxygen we breath and nitrogen make up 99% of the atmosphere. A small portion (0.04%) of the atmosphere is made up of other gases, some of which are known as greenhouse gases (GHGs).

These GHGs allow the Sun’s energy to enter the atmosphere but prevent it from leaving, by trapping it close to the Earth’s surface. Think of them as a blanket wrapped around the Earth, keeping the planet warmer than it would be without the gases. This is called the greenhouse effect (explained in Figure 1).

Figure 1. The natural greenhouse effect. The Earth absorbs some of the energy it receives from the sun and radiates the rest back toward space. However, greenhouse gases absorb some of the energy radiated from the Earth and trap it in the atmosphere. These gases essentially act as a blanket, making the Earth’s surface warmer than it otherwise would be. Source: EPA, 2012

Earth’s temperature with and without the natural greenhouse gas effect

The greenhouse effect keeps the planet at a comfortable temperature for us to live. Without it, Earth would be too cold for humans to survive, with an estimated average temperature of –18 °C. Freezing! (Figure 2).

Figure 2: How the Earth’s temperature would be with and without the natural greenhouse effect. 15 °C is the Earth’s “normal” average temperature. Source: André, C. 2022.

Humans are changing the climate

The greenhouse effect occurs naturally. However, human activities are changing the Earth’s climate.  As we burn fossil fuels, like coal and oil, we are putting more GHGs into the atmosphere. Too many of these gases cause Earth’s atmosphere to trap more and more heat. The Earth is warming up. Research shows that each of the last four decades has been warmer than any previous decade since 1850. The world is warming faster than at any time in at least the last two thousand years. 

How the concentrations of key GHGs have been increasing

Since the Industrial Revolution, which saw the introduction of machinery for manufacturing in the 1800s, humans have been putting an increasing amount of GHGs into the atmosphere. Let’s look at how some of the main GHGs have been increasing.

Carbon dioxide

Carbon dioxide (CO2) is the main GHG emitted by human activities. It is released by burning fossil fuels like coal, natural gas and oil. It also comes from natural sources and is produced when vegetation decomposes and during wildfires. It can also be released from the oceans. 

Since the Industrial Revolution, concentrations of carbon dioxide in the atmosphere have been rising rapidly. As you can see in Figure 3, which shows the global average concentrations of carbon dioxide in the atmosphere over the past 800,000 years, there has been a rapid rise in concentrations over the past few centuries, and in recent decades particularly. 

Before the Industrial Revolution, atmospheric concentrations of carbon dioxide did not rise above 300 ppm. This changed when humans started burning fossil fuels.  Today’s concentrations are the highest they have been for at least 800,000 years. (Note: while there are fluctuations over hundreds of thousands of years, these were caused by changes in the Earth’s orbit around the sun). 

Figure 3: Concentration of carbon dioxide in the atmosphere for the past 800,000 years. (BCE stands for Before the Common Era). Source: Ritchie et al., 2020.

Methane

Methane accounts for about 20 percent of global emissions and is more than 25 times as potent as carbon dioxide at trapping heat in the atmosphere.

Human activities, such as agriculture, burning oil, gas and coal for energy, and increased production of waste from homes and businesses, put methane into the atmosphere. It also comes from natural sources, such as wetlands. 

In Figure 4, we see how methane concentrations have more than doubled since the year 1900! 

Figure 4: The change in methane concentrations in the atmosphere since 1750. Methane concentrations have been increasing rapidly in recent centuries. Source: Ritchie et al., 2020.

Nitrous oxide

Carbon dioxide and methane are the largest drivers of anthropogenic climate change. But nitrous oxide also plays a role. Commonly known as “laughing gas,” it is a potent GHG that is 300 times more powerful than carbon dioxide. Globally, about 40% of total nitrous oxide emissions come from human activities. Agriculture is the primary source.

Agriculture is the primary source of nitrous oxide emissions. Credit: Jean Beaufort/Public Domain Images

Like carbon dioxide and methane, nitrous oxide concentrations have increased significantly throughout the 20th century. Concentrations of nitrous oxide have risen by more than 20% from pre-industrial levels. This coincides with the rising use of fertilizers and large increases in global food production.

How do we know climate change is linked to rising emissions?

The Intergovernmental Panel on Climate Change (IPCC) is a United Nations body, made up of top scientists from 196 countries, that assesses the science related to climate change. It releases regular reports about climate change and its implications and future risks. 

In its 2021 report on the physical science basis of climate change, the IPCC did not mince its words about the links between human activities and climate change. The report opens with these words: “It is unequivocal that human activities have heated our climate. Recent changes are rapid, intensifying, and unprecedented over centuries to thousands of years.”  

To learn about past temperatures and carbon dioxide concentrations, scientists have analyzed the chemistry of water molecules and air bubbles that have been trapped for centuries in ice layers in Antarctica and Greenland. They have found that carbon dioxide concentrations correlate positively with past temperatures, meaning that samples with higher carbon dioxide concentrations also date from periods when temperatures were higher.

Energy is the main source of GHG emissions 

Humans produce GHGs in many ways. But the main culprit is burning fossil fuels to create energy. As you can see in Figure 5, almost 75% of emissions come from energy, while close to 20% come from agriculture and land use (this proportion increases when we consider the food system as a whole and include processing, packaging, transport and retail). The remainder come from industry and waste.

Figure 5: CARE (based on data from Our World in Dataxx and WRI).

Developed countries are responsible for most emissions 

Countries in Europe, Asia and North America are responsible for the largest contribution of GHGs in the atmosphere. Regions with developing countries, such as Africa, Latin America and large parts of Asia, are only responsible for a small proportion of these emissions (Figure 6).

Since carbon dioxide added to the atmosphere can stay there for centuries, historical emissions are just as important as – or even more important than – current emissions. This means that although China is the biggest emitter today, historically the United States and Europe are responsible for half of the carbon dioxide emitted since pre-industrial times.

The richest 10% of the world’s population are responsible for more than half of global carbon emissions, according to Oxfam. And the richest 1% is responsible for twice the emissions of 3.1 billion people (measured between 1990 and 2015).

Figure 6: Cumulative carbon dioxide emissions by countries from 1751 to 2020. Source: CARE International (using data from Ritchie et al., 2022).

Increasing emissions are changing our climate 

We are living in a changing climate. Already, the world is witnessing widespread changes as temperatures rise, glaciers melt, and droughts and floods intensify. The impacts of climate change are expected to worsen, which makes it crucial to take climate action now.

Flooding in Bangladesh. Credit: Moniruzzaman Sazal/Climate Visuals Countdown.

The severity of climate change impacts depends on how much and how quickly the world warms. For example, climate-related risks are higher if the world warms by another 1.5 °C above pre-industrial levels by the end of the century. However, they will be even worse if the temperature rises by 2 °C. Climate change also affects regions differently. For example, Africa is warming faster than the global average over both land and oceans. 

The climate is changing, and more change is on the way

Scientists with the IPCC have studied how climate change is already affecting the world. They use sophisticated computer models to predict how climate change will impact the planet in future. Below, we look at some of the main changes. 

RISING TEMPERATURES

The IPCC estimates that human activities have caused the Earth to warm by approximately 1.1 °C above pre-industrial levels by 2020. Figure 7 shows how the temperature has been rising since 1880.

Figure 3: Concentration of carbon dioxide in the atmosphere for the past 800,000 years. (BCE stands for Before the Common Era). Source: Ritchie et al., 2020.xi

Different parts of the world are warming at different rates. The polar regions have experienced the largest increase in temperature (in relation to the global average) while North Africa has experienced the greatest increase in Africa.

Different scenarios are expected to play out depending on how the world deals with emissions. These include situations where carbon dioxide emissions:

A

Carbon dioxide emissions are reduced to a level that allows global warming to be kept to 1.5 °C by 2050 (optimistic scenario).

B

Carbon dioxide emissions are reduced to a level that allows global warming to be kept to 1.5 °C by 2050 (optimistic scenario).

C

Carbon dioxide emissions remain the same as they are now but start to decrease after 2050 and net zero emissions are not reached until 2100. This results in global warming of 2.7 °C (middle-of-the-road scenario).

D

Carbon dioxide emissions reach double those of current levels in 2100. This results in a temperature increase of 3.6 °C above pre-industrial levels (dangerous scenario).

E

Carbon dioxide emissions double current levels by 2050. This results in global warming of 4.4 °C above pre-industrial levels (“taking the highway” scenario).

These different scenarios for temperature rise result in different levels of warming across different parts of the world. As you can see from Figure 8, warming by 1.5 °C keeps temperature rise low in most parts of the world, even though the polar regions experience the largest change in average temperature.

Figure 8: Annual mean temperature change (°C) relative to 1850–1900. Polar regions will experience an even higher increase in average temperature. Source: IPCC, 2021

If we do nothing to curb emissions, we are on a dangerous path. If the global community does not decrease emissions and follow current climate change policies, global warming is expected to reach 2.6 °C to 2.9 °C above pre-industrial temperature levels by the end of the century.

As it stands, the world needs stronger commitments to climate action. Current policy commitments are unlikely to keep emissions at a level required to limit warming to 1.5°C and will also make it harder after 2030 to limit warming to below 2°C (Figure 9).

Figure 9: Projected global GHG emissions over 2015-2050 based on current policies and commitments by countries. Source: Adapted from chart produced by Dr. Valérie Masson-Delmotte.

CHANGING RAINFALL PATTERNS

With changing rainfall patterns, dry areas are expected to become drier. In future, the Mediterranean, Southern Africa, Southwest Australia, Southern Chile, the West Coast of Mexico, and much of the tropical and subtropical Atlantic Ocean are likely to have less precipitation. 

This drying will make droughts more severe. At the same time, models show that when rain does fall, it will become more intense nearly everywhere, increasing the risk of flooding.

Changes in precipitation also impact soil moisture, which affects farmers’ ability to grow crops. Parts of the world, such as Central Africa and East Africa, will experience increasing soil moisture levels under all warming scenarios.  Others, such as Latin America, will experience drier soil. 

RISING SEA LEVELS

Since 1990, the sea level has risen by about 80mm globally. The increase is not uniform across the world. The sea has risen higher in some areas than in others. This is mainly due to differences in thermal expansion and salinity (the levels of salt in ocean water) in different places.  

A man salvages bricks from his house as the water encroaches. Shariatpur, Bangladesh. Credit: Moniruzzaman Sazal/Climate Visuals Countdown.

By 2100, sea levels could rise by up to 1.1 meters, according to the IPCC. If we fail to properly address climate change and cut emissions, this could trigger an irreversible sea level rise of several meters by 2300.

Sea level rise creates big problems for coastal areas, mainly through flooding. It has other impacts too. As the rising sea crawls farther and farther up the shore, in many places it will seep into the freshwater in the ground that many coastal areas rely on for drinking water, contaminating these.

Rising sea levels can negatively affect farmers. The intruding sea can make groundwater used for irrigation saltier and change the soil quality, making it harder to grow crops. Rising sea levels also negatively impact biodiversity in coastal areas and can make the damage from tropical cyclones worse.

In Africa, sea levels are rising faster than the global average. Sea level rise is likely to continue around Africa, resulting in more frequent and severe coastal flooding. 

MELTING GLACIERS

Globally, glaciers are disappearing as temperatures rise. more than 600 glaciers have disappeared over the past decades, a staggering loss. Even if there is no further warming, many more glaciers will disappear. It is also likely that some mountain ranges will lose most, if not all, of their glaciers.

Africa’s glaciers are melting faster than the global average. The total glacial area on Mount Kenya decreased by approximately 44% between 2004 and 2016. Mount Kilimanjaro is also losing its glaciers.

Part of the rapidly receding glacier on the peak of Mt. Kilimanjaro, Tanzania, 2011. Credit: Sarah Skiold-Hanlin

The loss of glaciers has profound impacts, mainly for the people and ecosystems that rely on the rivers fed by glaciers. When glaciers disappear, there is a tremendous impact on the availability of water across the seasons and, thus, for people living along riverbanks. Melting glaciers also contribute to sea level rise. 

WORSENING EXTREME EVENTS

Climate change is impacting extreme events, unusually severe weather or climate conditions that can have devastating effects. 

Heat waves

Climate change is affecting the frequency, intensity and duration of heat waves. It is likely that human influence has more than doubled the probability of the occurrence of heat waves in some places.

Cyclones

In the 21st century, it is likely that the global frequency of tropical cyclones will either decrease or remain essentially unchanged. However, cyclones will likely have higher maximum wind speeds and rainfall rates, making them more destructive.

Droughts

While changes in future precipitation are uncertain, the drying associated with warmer temperatures will become much more widespread. This means droughts are likely to happen more often. The frequency of droughts is expected to double in southern Africa, Southeast Asia and the Mediterranean.


We need to act now

The science shows that climate change is happening and is expected to get worse. This means we need to take action to limit climate change and deal with its consequences. The two main courses of action are called mitigation and adaptation.

Mitigation

Mitigation involves cutting anthropogenic emissions, through actions such as switching from coal-powered energy to renewables. It also includes actions that help natural systems absorb emissions, such as protecting forests, which naturally remove carbon dioxide from the air. 

Adaptation

Adaptation involves managing the current and future impacts of climate change. Because emissions are still rising, and climate change is expected to get worse, we need to adapt to protect people and their livelihoods. Adaptation involves actions such as planting drought-resistant crops or implementing early warning systems to communicate about extreme weather with vulnerable communities.  

Unfortunately, people in vulnerable communities do not always have the resources to adapt to climate impacts. In the face of flooding, drought and other extreme events, people may lose their homes, livelihoods and loved ones. This is called loss and damage.

In the face of the climate crisis, innovative adaptation actions are urgently needed to limit loss and damage and protect the most vulnerable in society. In the following modules in this toolkit, you will learn about ways that you can take the lead on driving adaptation action in your community and beyond.    

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Heat Wave

Heat Wave

Deepen your understanding. Find links to supporting scientific research, important publications, and tools

The climate system

READ more about the climate system in this IPCC overview where you will find detailed technical explanations and deepen your scientific knowledge about the climate system. 

WATCH this video, Earth’s Energy Budget (3:06) to learn more about how the Earth’s climate system works.


Causes and effects of climate change

WATCH the video, Why reducing our carbon emissions matters (a little story about climate change) (3:32) to better understand the links between carbon dioxide emissions and rising temperatures

EXPLORE the Our World in Data website to learn more about current and historical emissions. You can also explore consumption-based emissions on this site.

WATCH the video What is Climate Change? (6:03). The video defines climate change and explains the greenhouse effect and the role of greenhouse gases in our atmosphere. While it explores the consequences of climate change for our environment – such as rising sea levels, more frequent extreme weather, and damage to our ecosystems – it also suggests big and small changes we can make to protect our Earth.

WATCH this short video from National Geographic, Causes and Effects of Climate Change (3:04), to understand more about the causes of climate change and its main impacts. The video describes the greenhouse effect, how it works (such as causing melting of ice caps in the Arctic regions) and the effects of greenhouse gases on the atmosphere and life on the planet.

WATCH the video What Is the Greenhouse Effect? from NASA (2:30), which further explains the greenhouse effect. It shows how energy from the Sun is integrated into the Earth’s system and the role of greenhouse gases in raising the planet’s average temperature. The video highlights the different sources of greenhouse gases and how researchers monitor these gases to understand how they affect the planet.

WATCH Global temperature anomalies from 1880 to 2017 (0:36). In the video, you can see how temperatures across different parts of the world have increased over a period of 137 years, with some places warming faster than others. You will notice that the Arctic regions are warming faster, which means that ice in these regions is melting, resulting in sea level rise.

READ more about the causes and impacts of climate change and learn about key concepts with NASA’s Global Climate Change website.

EXPLORE temperature graphs on the Climate Action Tracker. The IPCC’s sixth assessment report says, “Global surface temperature was 1.09 [0.95 to 1.20] °C higher in 2011–2020 than 1850–1900, with larger increases over land (1.59 [1.34 to 1.83] °C) than over the ocean (0.88 [0.68 to 1.01] °C).” But this starts at relatively late values (1850–1900) and over the last 10-year average, so 1.2 °C is a more appropriate description of where we are now.

EXPLORE the UNDP Climate Box toolkit, an illustrated textbook which provides information on climate change science and impacts, as well as solutions, best practices and case studies on how to reduce your personal carbon footprint and adapt to inevitable impacts.

EXPLORE these posters and illustrative material on climate change impacts, mitigation and adaptation from UNDP’s Climate Box.

LEARN how to explain climate change in simple terms with the UNDP’s useful Climate Dictionary: an everyday guide to climate change.

LEARN about climate change in simple, non-technical terms by reading the IPCC’s Climate Change 2021: Summary for All.


Greenhouse gas emissions

LEARN about current and historical emissions with the Our World in Data website. Here you will see information such as the amount of carbon dioxide emissions that have come from different sectors and changes in emissions. 

EXPLORE: Did you know that there are consumption-based as well as production-based emissions? Consumption-based emissions that are generated through consumption of goods or products. In some instances, these goods or products are not made in the locations where they are consumed. Have a look at  Our World in Data to learn more about consumption-based emissions. 


The importance of climate data

Using up-to-date climate data is key to implementing relevant adaptation projects and programs. It can also help with your advocacy efforts. The list below offers sources to find data on climate change, including current and expected impacts for different regions.  

The Intergovernmental Panel on Climate Change

The Intergovernmental Panel on Climate Change (IPCC) is the United Nations body for assessing the science related to climate change. It gathers hundreds of experts from all over the world. The IPCC was created to provide policymakers with regular scientific assessments on climate change, its implications and potential future risks, as well as to put forward adaptation and mitigation options. The last assessment is available here (click on the cover to open the summary for policymakers):

The IPCC also developed a helpful tool for visualizing climate data.

World Bank Climate Change Knowledge Portal

The World Bank Climate Change Knowledge Portal provides global data on historical and future climate vulnerabilities and impacts. You can explore the data via country, region and watershed views. You can also access country profiles to gain deeper insights into climate risks and adaptation actions.

USAID Climate Risk Profiles

USAID provides regional and country climate risk profiles. These include the following information by country: an overview, its climate, projected changes and information on sector impacts, vulnerabilities to climate change, the policy context, and information regarding ongoing climate change projects. Access USAID’s climate website where you can find your country’s climate risk profile.

Forecast information

Climate research and meteorological institutions may also have more precise and local data for your region. You can access weather-related forecasts at the links below:

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Bright Spark

Bright Spark

Read case studies, watch videos, and listen to podcasts about young climate leaders to get fired up for your own climate change actions!

Videos

EXPLORE the WWF’s Love it or lose it campaign, featuring short videos focused on our interconnected relationship with nature and what is at stake if we lose it. This is an unusual approach to communicating climate change as we often encounter war metaphors associated with a “fight against climate change” and “combating climate change.” As young climate advocates it is important to think about how you communicate your messages to people to motivate them to act for the climate and remember that people are motivated by more than fear and anger. The WWF videos tap into what matters to people – good relationships with family, friends and places. 

Podcasts

LISTEN to the podcast South of 2 Degrees to learn about the science of climate change and its impacts.

LISTEN to the Youth Climate Champions Podcast, which is part of the Climate Action to Accountability Project. The shows feature youth climate activists from South Africa, and discussions on issues like climate policy.  

Games

Games are a fun but serious way of helping humanity tackle the complexities and uncertainties of climate change. Check out the Games for a New Climate from the Red Cross and Red Crescent Climate Centre. You can use these to learn, and teach others, about climate change while having some fun.

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Cool Down

Cool Down

Your last stop. Here, you have space to test your knowledge (with a short quiz) and consider how you can apply what you have learned to your own climate action.

Test your understanding

You have learnt a lot and have many red hot ideas. Test your knowledge with a quiz and give yourself space to cool down and reflect on what you have learnt. Use this section to take stock of how you will put your skills into action.

1 / 6
Climate change refers to:
Correct answer: b) a change in the state of the climate with these changes persisting for longer periods of time (e.g., decades, or longer)

Explanation: Climate change refers to the long-term changes in the Earth’s climate. It causes weather patterns to be less predictable, affecting the balance of Earth’s precious ecosystems. These changes persist for long periods of time, typically decades or more. Climate change can be due to natural processes, such as changes in how much energy the sun produces and volcanic eruptions. However, humans are changing the climate by pumping heat-trapping gases from burning fossil fuels into the atmosphere. This is called human-induced or anthropogenic climate change. 

2 / 6
True or false: The greenhouse effect is the way through which greenhouse gases allow the sun’s energy to enter the Earth’s atmosphere but prevent it from leaving.
Correct answer: a) True

Explanation: The greenhouse effect is the way through which heat is trapped close to Earth’s surface by greenhouse gases. These heat-trapping gases allow the sun’s energy to enter the atmosphere but prevent it from leaving. These gases can be thought of as a blanket wrapped around Earth, keeping the planet warmer than it would be without the gases. 

3 / 6
How much has the global temperature increased since 1850? 
Correct answer: c) By over 1°C

Explanation: The IPCC estimates that human activities have caused the Earth to warm by approximately 1.1 °C above pre-industrial levels by 2020. 

4 / 6
By the year 2100, sea level could rise by up to:
Correct answer: b) 1.1 meters

Explanation: According to the IPCC, by 2100 sea levels could rise by up to 1.1 meters.

5 / 6
Which characteristics of cyclones will change because of climate change?
Correct answer: a) wind speed and rainfall rates

Explanation: In the 21st century, it is likely that the global frequency of tropical cyclones will either decrease or remain essentially unchanged. However, cyclones will likely have higher maximum wind speeds and rainfall rates, making them more destructive. 

6 / 6
What is mitigation?
Correct answer: c) actions that help reduce emissions or help natural systems absorb emissions

Explanation: Mitigation involves cutting anthropogenic emissions, through actions such as switching from coal-powered energy to renewables. It also includes actions that help natural systems absorb emissions, such as protecting forests, which naturally remove carbon dioxide from the air

Congratulations
You have now completed this module

Your quiz score is 0 correct answers out of 6 questions.

Reflect and prepare for your climate adaptation action

Consider the following questions about climate change:

  • What are the current and forecasted impacts of climate change in your country or community?
  • Can you name any mitigation and adaptation activities that you have observed in your country or community?
  • Do you think current action by countries globally is enough to address climate change?

 

Bonus quiz: To further test your knowledge of climate change, do this online quiz developed by UNDP. It covers three topics:

  • The problem of climate change
  • The impacts of climate change
  • Mitigating the impacts of climate change