WHAT IS CLIMATE CHANGE?
Widespread improvements in the quality of life of many of the world’s populations have gone hand-in-hand with increased demands on natural resources. The planet is struggling to keep up, with increases in the average global temperature and the frequency of extreme weather events transforming ecosystems around the world and threatening entire species of plants and animals. Forests are drying up, there is less rainfall and more fires, and the glaciers of both the North and South Poles are shrinking. The consequences of climate change affect all of us, but in order to react and adapt to it, we must first understand it.
per million (ppm)
carbon dioxide (CO₂) concentration in the atmosphere is at its highest in the last 650,000 years.
19 of the hottest years since 1880 were measured after the year 2000.
Arctic sea ice
Arctic sea ice
The Arctic is warming about 2 to 3 times faster than the rest of the planet. Every 10 years, about 13.1% of the mass of the Arctic ice sheet melts.
tons per year
Satellite data shows that the mass of the polar ice sheet is decreasing.
Global sea level
The global average sea level has risen by 190 mm in the last 100 years. as a result of melting glaciers. Even such sea level rises can threaten coastal areas or port functions.
Climate, weather, and natural disasters01
Climate is not the same as weather, but the two terms are closely related. While weather refers to short-term conditions that can change quickly, climate determines the long-term character of a given place, for instance, whether it is temperate or tropical. The relationship between weather and climate is crucial: the former is subordinate to the latter. Climate determines temperatures, weather diversity, the traits of winters, rainfall totals, as well as the nature of meteorological phenomena such as the severity of storms. It is due to this delicate relationship that we are facing both temperature rise and more frequent weather extremes and natural disasters as a result of climate change.Source: Study: ATTRIBUTION OF Extreme Weather Events IN THE CONTEXT OF Climate Change People in Need and Climate
Extreme temperatures, drought, forest fires
Floods, mass movements
Tropical, extratropical, convective, and local storms
Tropické, extratropické, konvektivní a lokální bouře
Earthquakes, tsunami, volcanic activity Geophysical phenomena are not directly linked to climate and weather changes, although their effects are often extreme.
as a Greenhouse
Solar energy in the form of radiation reaches the earth, where two thirds of it gets absorbed by the planet’s surface. The rest is reflected back into the atmosphere where greenhouse gases operate. These then reflect the energy back to earth where it again converts to heat – this process keeps the planet habitable.This phenomenon is called the greenhouse effect. Naturally, with the increasing amount of greenhouse gases in the atmosphere, this effect intensifies, leading to global temperature rise. Excessive temperature rise due to human activity is called global warming.
Greenhouse gases occur naturally in the atmosphere. They let the sun's rays pass through, while absorbing the thermal energy radiated by the earth's surface, keeping our planet warm. Without enough of these gases, the earth would be as cold as Mars. Conversely, with an extremely high concentration, the earth would become too hot, much like Venus.
The main greenhouse gases in the earth's atmosphere are water vapour (H2O), carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ozone (O3). Human activity has led to increases in concentration of all of the greenhouse gases, with the exception of water vapour.Source: NASA Source: Brittanica
Carbon dioxide is one of the main greenhouse gases from human activity that contributes to climate change. The burning of fossil fuels, as well as ploughing, the melting of permafrost (permanently frozen soil), and the decomposition of organic matter, all contribute to increased levels of carbon dioxide, or CO2. Huge amounts of carbonaceous matter in the form of oil and coal were buried deep in the earth during the Paleozoic Era. Large areas of horsetail, lycophyte plants, and marine plankton removed most of the CO₂ from the atmosphere, using it to grow and multiply. After their death, these plants sedimented to the bottoms of wetlands and seas and, in the absence of oxygen, turned into coal and oil. By burning and mining them, we are releasing CO₂ back into the atmosphere. Interestingly, in the Proterozoic era, the concentration of CO₂ in the atmosphere was about 3 times higher than it is today (but the sun’s energy was approximately one third weaker, so the temperature was comparable to current conditions).
Methane is a greenhouse gas 30 times more potent than CO₂. It is created in an environment with no access to oxygen, through methane fermentation. Large amounts of methane are released during oil and gas extraction and transportation, through livestock farming, from landfills, and through rice cultivation. It is also formed at the bottom of dams and in the oceans, as well as in the estuaries of the world's rivers that contain water enriched with fertilisers. These conditions lead to the depletion of oxygen, leading to the formation of huge, oxygen-free zones. Today, these ‘dead zones‘ cover areas the size of entire continents.Source: Nature Magazine
Nitrogen oxides are greenhouse gases 300 times more potent than CO2. The main sources of nitrous oxide emissions are the burning of fossil fuels in transport and industry, industrial agriculture, as well as the production of some chemicals, including fertilisers. Therefore, the largest contributors are industrial agriculture, especially chemical fertilisers, but also transportation. In addition to the properties of the greenhouse gas, nitrous oxide also damages the ozone layer.
It is estimated that humans have cut down about half of all of the world’s forests. Most of the current deforestation is linked to burning and cutting down tropical rainforests – primarily for agriculture or grazing, for the production of charcoal and, secondarily, for logging wood as a material. Although tropical rainforests cover only about six percent of the Earth's surface, they have a significant impact on the global climate. Tropical forests have the highest photosynthetic productivity as well as the ability to cool the earth's surface of all forests on Earth, helping to mitigate global warming. They are also centres of global biodiversity as they host a large proportion of the world's animal and plant species.Source: National Geographic Source: The Food and Agriculture Organisation of the UN, 2020: The State of World’s Forests - Forests, biodiversity and people
Natural forces that contribute to climate change include the intensity of sunlight, volcanic eruptions, and changes in the concentration of naturally-occurring greenhouse gases. According to NASA, these natural phenomena are still relevant today, but their impact compared to human influence is too small or too slow for natural causes to constitute a major cause of the rapid warming observed in recent decades. Without human activity, the climate would have remained virtually unchanged for the last 100 years.Source: NASA
Burning fossil fuels
For millions of years, the concentration of greenhouse gases in the atmosphere fluctuated only slightly; natural processes removed as many greenhouse gases from the atmosphere as were released. Problems arose when people began to extract and burn fossil fuels on a large scale, thus releasing unprecedented amounts of CO2 into the atmosphere. The concentration of CO2 has increased by almost 50 percent since the Industrial Revolution.Source: NASA
Burning fossil fuels for electricity, heat, in industry and in transportation; deforestation; overuse of chemical fertilisers; and industrial animal production all increase the concentration of greenhouse gases in the atmosphere, leading to global warming (more here). Future temperatures and the entire course of climate change are directly linked to the amount of greenhouse gases humans release into the atmosphere.
Positive feedback: vicious cycle
Along with these so-called anthropogenic emissions (emissions generated by human activity), greenhouse gases leaking from melting soil (permafrost) or, for example, from drying peat bogs, play an increasingly important role. These are not released directly by humans, yet we are responsible for them indirectly by the role we continue to play in the warming of the planet. At the same time, frozen or snow-covered surfaces reflect some of the sun's rays, and their melting darkens the Earth's surface and further warms it.Source: Intergovernmental Panel on Climate Change Source: NASA
Emissions by sector
The main greenhouse gas emitter is the energy sector. Other significant sources of greenhouse gases include transportation, industry (especially construction and mining), and agriculture.
Different human activities produce different greenhouse gases. For instance, agriculture produces methane most notably, while the burning of fossil fuels releases carbon dioxide especially.
Who are the biggest
Europe and the United States are mostly responsible for the current state of the atmosphere, having released more than 90 percent of the emissions that had accumulated in the atmosphere by the end of the 20th century. In recent decades, however, the rest of the world has begun to catch up. This is particularly true in the case of China, which is experiencing an unprecedented economic boom.Source: Our World in Data
Where do emissions
CO₂ emissions are usually measured in terms of their production on the territory of individual states. However, this calculation does not give us a complete picture of who is truly responsible for their creation. International companies often employ cheap labour in developing countries where they process raw materials, with the resulting emissions being attributed to the place of assembly, though the products are produced for for markets in richer countries, such as Europe or the USA - these countries thus "import" emissions created elsewhere. Typical "exporters" of emissions are China and Russia, while the USA, Western and Northern Europe, as well as a number of African countries are typical “importers” of emissions.
The largest exporter CO2
To calculate consumption-based emissions, it is necessary to monitor the movement of goods around the world. Whenever goods are imported, the emissions resulting from their production must be attributed to the country which receives the goods and, conversely, deducted from the country which produces and exports the goods.
The red colour on the map represents net importers of emissions, while blue indicates net exporters. For example, 20 percent means that a country imports 20 percent of its domestic emissions.Source: Our World in Data
Many of the countries that historically bear the most responsibility for greenhouse gas emissions are the least vulnerable to their consequences. Developing countries, which generally have less capacity to react and adapt, are the first to feel the most severe effects of climate change. They deal with the consequences in both temporary and permanent ways, such as migration. Climate change will thus be an increasingly important issue in relations between developing and developed countries.On environmental migration
Did you know that...
approximately 1.6 tonnes of CO₂ are released during a standard, transatlantic, round-trip flight. This is almost as much as the average annual emissions of one person in India. The average US citizen produces about 10 tonnes of CO₂ each year only through flying.
Celebrities including Paris Hilton, Jennifer Lopez, Emma Watson, and Bill Gates have such a large carbon footprint that they have earned the label “super emitters,” largely due to extremely frequent flying. Bill Gates, who in 2017 produced 1,600 tons of CO₂ with his private jet, is at the top of this ranking.
This shows another inequality in relation to climate change: although climate change will affect everyone on the planet, only a fraction of the planet’s citizens fly.Source: World Bank Group Source: The Independent
Degrees of global warming04
Since the 19th century, the earth has warmed by about 1.1°C. A new United Nations report addresses the differing consequences of warming by 1.5° or 2°C.
Half a degree may not sound like much, but the effects of global warming, be it a few tenths of a degree, may create a dramatic difference: it has the potential to expose tens of millions of more people around the world to dangerous heatwaves, water shortages, and coastal floods. Half a degree could also mean the difference between a world with coral reefs and a year-round polar cap, and a world without them.Source: Intergovernmental Panel on Climate Change
If current rates of warming continue, the "Hothouse Earth" scenario, which assumes that most of the planet will become uninhabitable, may become a reality. According to this scenario, agriculture will be possible only in northern latitudes, the world’s deserts will expand, tropical rainforests will be devastated, glaciers will melt, some cities will sink, most terrestrial biodiversity and marine life will be destroyed, the Gulf Stream will slow down or even stop, and a drastic reduction in the planet's habitability.
The carbon budget is the remaining amount of greenhouse gases that humans can emit before the planet warms by 1.5°C (or 2°C depending on the set limit). These calculations, like other climate models, are based on climate modeling. Research shows that climate modeling tends to predict the evolution of emissions and related warming relatively accurately. The risk of exceeding the 1.5 or 2 ° C limit is therefore very real, and although predictions of when exactly this will occur may vary by decades, in general, every tenth of a degree has implications for the quality of human life. Therefore, it is appropriate to apply the precautionary principle.Source: Climate Coalition
Did you know that...
there is a so-called “climate clock” in New York which counts down how much time is left until we reach climate disaster? The countdown is based on the carbon budget.
One of the biggest challenges we will face as a result of climate change is the massive migration of people to the less climate-endangered areas. Given that large portions of our planet will become virtually uninhabitable, people will begin to move en masse in an effort to fulfil their basic needs. There will be local conflicts over land and resources− the worst-case scenarios envisage a global conflict− and other impacts, for instance, increasing gaps and segregation between the rich and the poor, and the disintegration of nation-states.
Climate models are complex simulations of the planetary system that attempt to calculate possible future climate scenarios. There are many of these models, and they are constantly evolving. Based on climate models and hypothetical emissions scenarios, climatologists devise trajectories of global warming to the year 2100. The best-known emissions scenarios are called Representative Concentration Pathways (RCP), which show the evolution of global warming at various hypothetical levels of greenhouse gas emissions.
No climate policies
If no climate policies had been implemented, by the year 2100, the earth would warm by an estimated 4.1°C to 4.8°C relative to pre-industrial temperatures.
Current climate policies
Based on current climate policies being implemented, by the year 2100, the earth is projected to warm by 2.8°C to 3.2°C.
If all countries achieve the targets and pledges set within the Paris Climate Accord, by the year 2100, the earth will warm by 2.5°C to 2.8°C, thus exceeding the agreement’s target to keep warming well below 2°C, and ideally under 1.5°C.
Consistent adherence to 2 °
There are a range of emissions pathways that would enable us to limit average warming to 2°C by 2100. This would require a significant increase in the pledges made as part of the Paris Agreement.
Emissions pathways that would limit average warming to 1.5°C by 2100 would require an immediate and drastic reduction in global greenhouse gas emissions. For the time being, this scenario is highly unlikely.
What awaits the Czech Republic?
Climate change has reached the Czech Republic as well. The average temperature in the Czech Republic has risen by 2°C (compared to temperatures before the Industrial Revolution) – a degree higher than the global average. For years, we have been struggling with more tropical days and droughts, as well as more frequent fires, torrential rains, and flash floods. Therefore, it is necessary to adapt to the changing climate in time and start working on mitigation measures.More on climate change in the Czech Republic
What can we do?
The changing climate is an existential problem for humanity, but it can bring about the necessary change. With social and political change, new technologies and management methods, and proper care, we can create an economy based on renewable resources and immaterialist patterns of behavior that will support us all without destroying the planet. However, a sustainable society requires us to understand and plan for our impact on the planet, and to learn to manage that impact. That, in turn, requires systemic changes, the promotion of science, the development of sustainable technologies, and a willingness on the part of individuals to change their behaviour.More solutions to the climate crisis
The crux of the solution to the climate crisis lies in reducing our reliance on fossil fuels such as oil, carbon, and natural gas, and replacing them with renewable and cleaner energy sources, all while increasing energy efficiency. But effective change must come from above, starting at the level of international agreements and countries that have committed to complying with them.
More than half of the world's population currently lives in cities, and this proportion is expected to increase to almost 70 percent by 2060. Cities are responsible for consuming two-thirds of the world's energy and producing more than 70 percent of global carbon emissions. Even minor adjustments to urban policies can thus be of great importance – from reducing waste production and promoting affordable and sustainable urban transport, to building green buildings and making carbon dioxide emissions more costly.Zdroj: UN Zdroj: C40 Cities
While individuals alone will not reverse climate change by changing their consumption habits, our behaviour and attitudes certainly play an important role. In addition, individuals have the power to exercise their rights as citizens and as consumers, and to put pressure on their governments and international organisations to make the necessary systemic changes.
Climate change and People in Need06
We have been helping for more than 10 years
People in Need has been active in the struggle against climate change for more than a decade, working to help people around the world cope with its effects. We assist in crisis situations and focus on prevention. We help communities with advocacy and with implementing innovative adaptation and mitigation measures. Help with us.Activities of People in Need
Resources and materials
Distinguishing climate change facts from misleading claims and disinformation is critical in the fight against it. We have put together a list of resources and materials to help you find your way around the topic.Go to resources