Nuclear fission has become one of our largest global contributors to carbon-free electricity. It could play a major role in our transition away from fossil fuels because it has low levels of carbon dioxide (CO₂) emissions and minimal environmental impact. So, we had to ask: How effective and efficient is nuclear fission?

Nuclear fission effectively generates nuclear energy while improving air quality and promoting energy security; however, it is also a nonrenewable resource. Nuclear fission is efficient because it is energy-dense, has a small land footprint, and generates few waste products.

Keep reading to find out how effective and efficient nuclear fission is, what its pros and cons are, how safe or dangerous it is, and how it can mitigate climate change.

The Big Picture of the Effectiveness and Efficiency of Nuclear Fission

Nuclear fission, one of two ways to produce nuclear energy, is the generation of energy produced when splitting apart the nucleus of an atom. 

“Nuclear fission: a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.”

Cambridge Dictionary

All operating nuclear power plants today utilize the process of nuclear fission. Because of this, nuclear fission is commonly referred to as ‘nuclear energy’ in the data and literature. 

Here’s How Effective and Efficient Nuclear Fission Are

In terms of effectiveness, nuclear fission effectively generates nuclear energy that has a low carbon footprint, protects air quality, and promotes energy independence. However, it is also a nonrenewable energy source. 

In terms of efficiency, nuclear fission efficiently generates nuclear energy, has a small land footprint, and generates few waste products.

How Effective Is Nuclear Fission

Effectiveness involves completing a task with a desired outcome, typically a successful one. 

“Effective: producing the result that is wanted or intended; producing a successful result”

Oxford Dictionary

Nuclear fission is an effective way to generate nuclear energy that has a low carbon footprint, protects air quality, and promotes energy independence. However, it is also a nonrenewable energy source. 

Nuclear Fission Effectively Generates Nuclear Energy

Nuclear fission is an effective way to harness the vast amount of energy stored inside atomic nuclei and turn it into energy, as evidenced by the increase in installed capacity and electricity generation over the years. 

Nuclear energy accounted for roughly 10% of global electricity generation in 2022, generating approximately 2,500 TWh of electricity from approximately 413 GW of installed capacity.

Nuclear Fission Has a Low Carbon Footprint

Nuclear fission has one of the lowest carbon footprints out of all energy types. 

The carbon footprint is one of the ways we measure the effects of human-induced global climate change. It primarily focuses on the greenhouse gas (GHG) emissions associated with consumption and includes other emissions such as methane (CH₄), nitrous oxide, and chlorofluorocarbons (CFCs).

“Carbon footprint: the amount of greenhouse gasses and specifically carbon dioxide emitted by something (such as a person’s activities or a product’s manufacture and transport) during a given period”

Merriam Webster

On a life-cycle basis, nuclear fission emits 12 grams of CO₂ equivalent per kWh of electricity produced, the second lowest out of all fuel types.

Have a look at the illustration below to see the average life-cycle CO₂ equivalent emissions of different energy sources and how they compare to nuclear fission.

Nuclear Fission Protects Air Quality

Nuclear fission produces a fraction of the pollution and toxic chemicals that fossil fuels produce, helping to protect air quality.

Air pollution can cause numerous health problems including asthma, breathing difficulties, brain damage, heart problems, and cancer. Fossil fuel (coal and natural gas) combustion emits coal ash residue, toxic heavy metals, CO₂, carbon monoxide (CO), sulfur dioxide (SO₂), and nitrogen oxides (NO_x) into the atmosphere, impairing public health.

A 1-inch, Uranium-235 pellet contains the energy equivalent of 1 ton of coal. And since 1 ton of coal creates 2.086 tons (4,172 lbs) of CO₂ when it is burned, every 1-inch pellet of nuclear fuel directly avoids the emission of over 2 tons of CO₂ from our atmosphere.

In short, nuclear fission is a clean burning source of energy that produces minimal greenhouse gasses and emits no CO, SO₂, or NO_x, thereby helping to protect air quality.

Nuclear Fission Promotes Energy Independence and Energy Security

Nuclear fission can help us transition away from fossil fuels and toward an energy-independent future. 

Being able to produce your own electricity without the aid of foreign countries is an important step in becoming more self-sufficient. For example, in the US, Former President George W. Bush signed the Energy Independence and Security Act of 2007 to reduce US dependence on oil, expand the production of renewable energy, and confront global climate change. 

Although nuclear energy alone cannot shoulder the burden of the world’s electricity needs, it can shoulder a substantial amount. Nuclear energy accounted for roughly 9% of global electricity generation in 2023, generating 2,685 TWh of electricity from 440 power reactors with over 400 GW of installed capacity.

Nuclear Fission Is a Nonrenewable Energy Source 

Nuclear energy is a nonrenewable energy source that will eventually be depleted. 

Nonrenewable energy sources are those that will run out in our lifetime or will not be replenished in many, many lifetimes. 

“Nonrenewables: existing in limited quantities that cannot be replaced after they have all been used”

Cambridge Dictionary

Nuclear fission is classified as nonrenewable energy because nuclear fuel (Uranium) is a finite material that can only be found in certain locations in the Earth’s crust.

Nuclear power plants use the second most common isotope of Uranium (U-235) which has a relative abundance of only 0.7%. And most of the original U-235 on earth has already decayed because it has a half-life of about 700 million years.

Although nuclear power plants use only tiny amounts of Uranium in the fission process and can be used as a reliable energy source for decades to come, we will still run out at some point. And once we run out of Uranium-235, we won’t be able to generate the nuclear fission reaction anymore.

How Efficient Is Nuclear Fission

Efficiency involves performing a task while using the least amount of resources and producing the least amount of waste as possible.

“Efficient: working in a way that does not waste a resource (= something valuable such as fuel, water, or money)”

Cambridge Dictionary

Nuclear fission efficiently generates nuclear energy, has a small land footprint, and generates few waste products.

Nuclear Fission Efficiently Generates Nuclear Energy

Nuclear fuel is extremely energy-dense, so you don’t need a lot of it to create a lot of energy.

Nuclear fuel is extremely energy-dense, so you don’t need a lot of it to create a lot of energy. It would only take ten, U-235 pellets to power the average household for a year. 

A single, 1-inch tall Uranium-235 pellet contains the energy equivalent of:

• 1 ton of coal
• 120 gallons of oil
• 17,000 cubic feet of natural gas

Because it is so energy-dense, nuclear fission is also incredibly energy-efficient. And energy efficiency is beneficial because it conserves resources, saves money, and increases the reliability of our energy grid as a whole.

Nuclear Fission Has a Small Land Footprint

Nuclear fission produces more power on less land than any other energy source.

Nuclear power produces more electricity on less land than any other clean-air source. A standard, 1,000-megawatt facility requires only a little more than 1 square mile to operate, a number that is 360 and 75 times less than what is required for wind farms and solar power plants, respectively. 

Overall, nuclear fission uses only 0.3 square meters of land per megawatt-hour of electricity produced, the lowest out of all energy types.

To put it into perspective, it would take more than 3 million solar panels, or 430 wind turbines, to produce the same amount of power as a typical nuclear fission commercial reactor.

Nuclear Fission Generates Few Waste Products

Nuclear fission produces substantially less waste than other forms of energy.

Just as with any energy source, nuclear fission generates some waste products. But the amount generated is substantially less than other forms of energy.

A nuclear fission reactor supplying a person’s energy needs for an entire year produces only a brick-sized amount of nuclear waste. And only 5 grams of that, equivalent to the weight of a sheet of paper, is considered to be a high-level, radioactive waste.

In comparison, the average coal-fired power plant produces roughly 300,000 tons of coal ash and more than 6 million tons of CO₂ every year. In the US alone, you could fit all of its used nuclear fuel over the past 60 years into a single football field at a depth of less than 10 yards (30 feet).

Although nuclear power produces minimal waste, the waste that it does produce is radioactive and can remain hazardous for many thousands of years. These radioactive waste products include uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes.

What Are The 6 Pros and 3 Cons of Nuclear Fission

Nuclear fission has a low carbon footprint, protects air quality, has a small land footprint, is energy dense, generates few waste products, and promotes energy independence.

However, nuclear fission is also a nonrenewable energy source that can negatively impact the environment and generate nuclear waste.

What Are the 6 Pros of Nuclear Fission

Nuclear fission has a low carbon footprint, protects air quality, has a small land footprint, is energy dense, generates few waste products, and promotes energy independence.

What Are the 3 Cons of Nuclear Fission

Nuclear fission is a nonrenewable energy source that can negatively impact the environment and generate nuclear waste.

How Can Nuclear Fission Help Mitigate Climate Change

Climate change is a severe, long-term consequence of fossil fuel combustion. If left untreated, atmospheric CO₂ can remain there for tens of thousands of years and exacerbate the negative effects of climate change. Nuclear fission emits less CO₂ upon operation than fossil fuels and can therefore reduce our total emissions. 

How Is Climate Change Defined

Climate change is arguably the most severe, long-term global impact of CO₂. Every year, we emit approximately 37 billion tons of CO₂. The carbon found in fossil fuels reacts with oxygen in the air to produce CO₂. 

“Climate change: changes in the earth’s weather, including changes in temperature, wind patterns, and rainfall, especially the increase in the temperature of the earth’s atmosphere that is caused by the increase of particular gasses, especially carbon dioxide.”

Oxford Dictionary

When carbon enters the atmosphere, it absorbs sunlight and solar radiation, trapping the heat and acting as an insulator for the planet.

Since the Industrial Revolution, Earth’s temperature has risen a little more than 1 degree Celsius (°C), or 2 degrees Fahrenheit (°F). Between 1880-1980 the global temperature rose by 0.07°C every 10 years. This rate has more than doubled since 1981, with a current global annual temperature rise of 0.2°C, or 0.36°F, for every decade.

How Does Nuclear Fission Specifically Help Mitigate Climate Change

The global average concentration of CO₂ in the atmosphere today registers at 419 parts per million (ppm), the highest ever recorded. Nuclear fission can help lower this concentration because it can replace some of the burning of fossil fuels (e.g., coal, oil, natural gas) with a cleaner form of renewable energy.

Nuclear energy helps to avoid 1.5 gigatons of greenhouse gas (GHG) emissions per year and 180 billion cubic meters of global gas demand per year. In the past 50 years, nuclear energy has helped avoid over 70 gigatons of GHG emissions. 

Increasing nuclear fission energy usage can reduce CO₂ emissions, and the more we reduce CO₂ emissions, the more we combat the negative effects associated with climate change including temperature rise, sea-level rise, ice melting, and ocean acidification. When these rates are slowed, the earth’s biodiversity does not have to struggle to adapt to temperature and pH changes. People will not be displaced due to the flooding of coastal areas. And icebergs will continue to provide climate regulation. 

How Safe or Dangerous Is Nuclear Fission

Overall, nuclear fission is considered to be minimally dangerous. Holistically and throughout its life cycle, fission is safe and beneficial for human and animal health, the environment, and the energy grid. It is also significantly safer than fossil fuels and some other types of renewable energy.

Here’s How Safe Nuclear Fission Is

Overall, nuclear fission is a safe form of energy regarding human and animal health, the environment, the energy grid, and throughout all stages of its life cycle.

Here’s How Dangerous Nuclear Fission Is

Overall, nuclear fission is considered minimally dangerous in terms of human and animal health, the environment, the energy grid, and through all stages of its life cycle. 

Final Thoughts

Nuclear fission is effective because it has a low carbon footprint, protects air quality, and promotes energy security and independence. It has grown to make up 9% of our total global electricity generation, making it an effective clean energy technology.

Nuclear fission is efficient because it is extremely energy-dense, has a small land-use carbon footprint, and generates very few waste products. A single, Uranium-235 pellet contains the energy equivalent of 1 ton of coal, making it one of our most efficient energy sources.

Beginning to reverse the climate crisis means we have to cut CO₂ emissions now, and nuclear fission can help us do that. Nuclear fission has the second-lowest carbon footprint out of all energy types and emits a fraction of the CO₂ and air toxics that fossil fuels emit. 

Although its future remains uncertain due to negative public opinion, incorporating more nuclear fission-generated energy into our power grid has many benefits. 

Stay impactful,

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