
Fossil fuels are the primary driver of the climate crisis, and the world is facing a challenge to replace them with renewable energy sources. Fossil fuels are made from ancient biological matter that has been contained in a pressurised environment for hundreds of thousands of years, and there is a finite amount left in the Earth's crust. Renewable energy sources like wind, solar, and geothermal energy are more sustainable and do not release harmful CO2 emissions, but the challenge is whether they can meet the world's energy demands.
| Characteristics | Values |
|---|---|
| Can they be replaced? | Yes, but not with wind, solar or other green energy sources alone. Nuclear energy is the only solution capable of replacing fossil fuels at scale. |
| Why do we need to replace them? | Fossil fuels are the biggest driver behind the climate crisis and there is a finite amount in the Earth's crust. |
| What are the benefits of replacing them? | Renewable energy sources like wind, solar power and geothermal energy rely on constant and consistent resources. |
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What You'll Learn

Nuclear energy as a replacement for fossil fuels
Fossil fuels are the biggest driver behind the climate crisis, and transitioning to a more sustainable system is necessary to fight climate change. Fossil fuels are made from ancient biological matter that has been contained in a pressurised environment for hundreds of thousands of years. This is not a process we can recreate quickly, and estimates suggest that we will run out of fossil fuels in between 50 and 150 years.
Nuclear energy is the only solution capable of replacing fossil fuels at scale. Nuclear power is reliable and can be deployed on a large scale, directly replacing fossil fuel plants and avoiding the combustion of fossil fuels for electricity generation. Nuclear power plants generate continuously and exhibit capacity factors very close to 100%.
After the 1973 oil crisis, France began replacing almost all its fossil plants with new nuclear plants. The French finished the job in less than 15 years. Since then, those plants have been providing more than 70 percent of France’s electricity (most of the rest is hydropower). Today, excluding hydropower, France has the most reliable, cleanest, and cheapest electricity in Europe.
Qvist and Brook (2015) used historical data from the Swedish and French light water reactor nuclear programs (between the 1960s and 1990s) and concluded that the large-scale expansion of nuclear power globally is technically feasible to replace fossil-fuel electricity generation within 25–34 years, and meet the most stringent greenhouse-gas mitigation targets.
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Renewable energy sources
Fossil fuels are a finite resource, and it is estimated that we will run out in between 50 and 150 years. Renewable energy sources are more sustainable and can help to slow down and reverse the damage done to the planet by fossil fuels, which are the biggest driver of the climate crisis. Renewable energy sources such as wind, solar, and geothermal energy rely on constant and consistent resources. These energy sources are also healthier and more accessible in the long term.
Nuclear energy is the only solution capable of replacing fossil fuels at scale. After the 1973 oil crisis, France replaced almost all its fossil plants with nuclear plants in less than 15 years. Since then, those plants have been providing more than 70% of France's electricity. France now has the most reliable, cleanest, and cheapest electricity in Europe.
However, there are still technical, technological, and scientific hurdles to overcome before renewable energy sources can completely replace fossil fuels. Political will and corporate interests also play a role in the transition to renewable energy.
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The finite nature of fossil fuels
Fossil fuels are finite. They are made from ancient biological matter that has been contained in a pressurised environment for hundreds of thousands of years. This is not a process that can be recreated quickly, which means we will run out, and soon. Estimates say we will run through the remaining fossil fuels in between 50 and 150 years.
Fossil fuels are the biggest driver of the climate crisis, and transitioning to a more sustainable system is necessary to fight climate change. Renewable energy sources like wind, solar, and geothermal energy rely only on constant and consistent resources. However, it is not yet clear whether these sources could meet our energy demands without or with acceptable levels of CO2 emissions.
Nuclear energy is the only solution capable of replacing fossil fuels at scale. After the 1973 oil crisis, France began replacing almost all its fossil plants with new nuclear plants. The French finished the job in less than 15 years. Since then, those plants have been providing more than 70 percent of France’s electricity (most of the rest is hydropower). Today, excluding hydropower, France has the most reliable, cleanest, and cheapest electricity in Europe. It’s also the safest—no notable accidents.
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The climate crisis
Fossil fuels are the biggest driver of the climate crisis. They power our homes, offices, schools, prisons, public buildings, and manufacturing plants, and they are affordable and reliable. However, they release harmful CO₂ emissions into the atmosphere every day.
Renewable energy sources like wind, solar, and geothermal energy are more sustainable than fossil fuels. Fossil fuels are made from ancient biological matter that has been contained in a pressurized environment for hundreds of thousands of years. This is not a process we can recreate quickly, so we will run out of fossil fuels soon. Estimates say we will run through the remaining fossil fuels in between 50 and 150 years. Renewable energy sources rely only on constant and consistent resources.
Nuclear energy is the only solution capable of replacing fossil fuels at scale. After the 1973 oil crisis, France began replacing almost all its fossil plants with new nuclear plants. The French finished the job in less than 15 years. Since then, those plants have been providing more than 70 percent of France’s electricity (most of the rest is hydropower). Today, excluding hydropower, France has the most reliable, cleanest, and cheapest electricity in Europe. It’s also the safest—no notable accidents.
Transitioning to a more sustainable system is necessary to fight climate change and meet the increasing demand for cheap and accessible energy. This must be done before we run out of fossil fuels or we will face a world that cannot provide energy to all its inhabitants.
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The affordability of fossil fuels
Fossil fuels are affordable and reliable, but they are not sustainable. Fossil fuels are made from ancient biological matter that has been contained in a pressurised environment for hundreds of thousands of years. This is not a process that can be recreated quickly, and it is estimated that we will run out of fossil fuels in 50 to 150 years.
Renewable energy sources, such as wind, solar, and geothermal energy, are more sustainable than fossil fuels and do not produce harmful CO₂ emissions. However, renewable energy sources are currently more expensive than fossil fuels.
Nuclear energy is the only solution that has been proven to replace fossil fuels at scale. After the 1973 oil crisis, France replaced almost all its fossil plants with nuclear plants, and now has the most reliable, cleanest, and cheapest electricity in Europe.
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Frequently asked questions
Yes, but not easily. Fossil fuels are the biggest driver behind the climate crisis, and transitioning to a more sustainable system is necessary to fight climate change. Renewable energy sources like wind, solar, and geothermal energy are more sustainable than fossil fuels, as there is a finite amount of fossil fuels in the Earth's crust.
Renewable energy sources rely on constant and consistent resources, whereas fossil fuels are made from ancient biological matter that has been contained in a pressurized environment for hundreds of thousands of years. This is not a process we can recreate quickly, which means we will run out, and soon. Estimates say we will run through the remaining fossil fuels in between 50 and 150 years.
To some extent, it is a technical/technological/scientific hurdle, and to some extent, it is a matter of political will or corporate interests. Nuclear energy is the only solution capable of replacing fossil fuels at scale, but it is controversial.
After the 1973 oil crisis, France began replacing almost all its fossil plants with new nuclear plants. The French finished the job in less than 15 years. Since then, those plants have been providing more than 70% of France's electricity. Today, excluding hydropower, France has the most reliable, cleanest, and cheapest electricity in Europe. It's also the safest—no notable accidents.











































