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What is a Global Warming Potential (GWP)?
These days, when it comes to businesses and projects promoting their efforts to protecting the environment and mitigating excess emissions – we’ll often hear about carbon dioxide, but not the other elements that can impact our atmosphere in terms of Global Warming Potential (GWP).
Global Warming Potential (GWP) refers to the method used to determine how potent a specific greenhouse gas is in comparison to carbon dioxide.
In this article, we’ll explain what Global Warming Potential is, how it is calculated, examples, and how we can reduce the impact of these greenhouse gasses.
What is Global Warming Potential (GWP)?
Global Warming Potential, often shortened as GWP, refers to how potent each molecule of a greenhouse gas is in terms of how long it has been active in the atmosphere.
💡 The current Global Warming Potential (GWP) factors that are used to calculate how much heat a specific greenhouse gas will trap over a set amount of time has been used for over 100 years.
Global Warming Potential (GWP) works by comparing how much heat a certain greenhouse gas will emit with a simple baseline comparison to carbon dioxide (CO₂) – which has a GWP of 1.
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In short terms, Global Warming Potential (GWP) works to help us better understand the negative impact created by the various greenhouse gasses (GHG) emissions we are producing on a daily basis.
How is GWP calculated?
Global Warming Potential (GWP) is determined by two factors:
- Absorption – Certain gasses will trap more heat per molecule. Think in the same vein of how some snacks have a greater caloric density than others. One gas may trap more or less heat than the other.
- Length of Time in Atmosphere – Any gas that is more difficult to remove from the atmosphere, or has a longer “shelf life” in the air will have more time to create a lasting negative effect.
👉 Ultimately, Global Warming Potential (GWP) can help policymakers to better understand and prioritize which greenhouse gasses must be avoided to improve current international climate change policies – such with the Paris Climate Agreement.
What are some examples of greenhouse gasses that are measured by Global Warming Potential (GWP)?
Greenhouse gasses that are often measured in terms of GWP in comparison to carbon dioxide (CO₂) include methane (CH₄), nitrous oxide (N₂O), and various chlorofluorocarbons (CFCs).
💡 However, it is important to note that any and all greenhouse gasses can be compared to the GWP of 1 created by carbon dioxide – such as with ammonia, hydrocarbons, or HFOs: all of which have a GWP equal or even lower than carbon dioxide.
Some examples of gasses that will be measured by Global Warming Potential (GWP) include:
- Methane (CH₄) – This greenhouse gas has a Global Warming Potential (GWP) of about 27-30 over 100 years, making it up to 30 times more effective at trapping heat in comparison to carbon dioxide.
- Nitrous Oxide (N₂O) – As a greenhouse gas with a GWP of almost 300, nitrous oxide is one of the most dangerous high GWP pollutants.
- Chlorofluorocarbons (CFCs) – In addition to Hydrofluorocarbons (HFCs), Hydrochlorofluorocarbons (HCFCs), Perfluorocarbons (PFCs), and Sulfur hexafluoride (SF6) – these greenhouse gasses are oftentimes referred to as “high GWP gasses”. This is because they have the ability to trap up to tens of thousands of GWP in accordance with their given amount of mass.
The table below will further compare the differences between these listed substances:
| Gas | Source | GWP (100 years) | Environmental Impact |
|---|---|---|---|
| Methane (CH₄) | Livestock, landfills, natural gas production | 28-36 | Powerful greenhouse gas that contributes to global warming over a shorter period but is less persistent than CO₂. |
| Nitrous Oxide (N₂O) | Agricultural practices, industrial activities, fossil fuel combustion | 298 | Long-lasting gas that contributes to both global warming and the depletion of the ozone layer. |
| Chlorofluorocarbons (CFCs) | Refrigerants, aerosol propellants (now largely phased out) | 4,600 - 10,900 (depending on the type) | Extremely potent greenhouse gases that damage the ozone layer and have a long atmospheric lifetime. |
👉 Many people have a tendency to focus on the impact created by carbon dioxide emissions, but Global Warming Potential can help shed light on the substances that could prove even more damaging to our environment.
Why is Global Warming Potential (GWP) important?
Global Warming Potential (GWP) is important as it can allow policymakers and the general public alike to realize that climate change and excessive heat are being exacerbated by not only carbon dioxide, but other potentially more potent greenhouse gasses.
💡Therefore, Global Warming Potential (GWP) is imperative in helping lawmakers and international organizations buckle down on prohibiting the various substances most harmful to our atmosphere..
Think about when you set out on an effort to run a marathon – while it will of course be crucial to increase your durability when running via cross-training, you’ll also have to think about other factors which could have an impact on your performance such as diet, sleep, and stress.
The same goes for various, more potent greenhouse gasses in the atmosphere – it is equally and perhaps even more important to take those into consideration as opposed to the GWP of 1 associated with carbon dioxide emissions.
Here are some other reason why Global Warming Potential (GWP) is important:
- Prioritizing Emission Reduction Efforts – Global Warming Potential (GWP) is indispensable for lawmakers trying to determine which helps policymakers identify which greenhouse gasses are most harmful to the environment. As a result of GWP, policymakers can more effectively and easily decide which substances should be greatly reduced or even eliminated for the sake of the environment.
- Benefit Individual Industries – GWP can help industries such as agriculture or aviation can better understand the impact of their activities as a result of calculating the Global Warming Potential of the substances frequently associated with their business endeavors. This can allow sector-specific companies to ensure compliance with current industry policies and also provide them the opportunity to lead by example.
- Boost Public Awareness – In the same way that many people may not have realized that soda is sugar as a result of viral online videos, GWP can help to educate the public regarding the impact created by greenhouse gasses. In addition to this, all of the relevant information as a result of GWP can help to encourage greater emission reductions in public settings such as gyms, schools, and more.
- Improve the Carbon Market – GWP can help the voluntary carbon market to assign the proper value to various carbon credits and offset projects as GWP helps to standardize the value of greenhouse gasses.
- Enhanced Long-Term Legislation for Climate Change – Global Warming Potential (GWP) will undoubtedly help to predict the long-term effects of various substances such as methane emissions, which in turn – will help policymakers to make improved long-term decisions to adhere to international protocols such as the Paris Agreement.
👉 Overall, the main goal of Global Warming Potential (GWP) is to determine which substances could prove most detrimental on our journey to decarbonization, reducing air pollution, and fighting climate change as a whole.
What are some real life examples of Global Warming Potential (GWP)?
Some examples of greenhouse gasses with a high Global Warming Potential (GWP) being used in everyday life include agriculture, air conditioning, and refrigeration.
As the industrial revolution took off, we became accustomed to relying on various substances with a high GWP to operate our daily machinery and manufacturing processes – something that will be essential to change if we want to put a halt to these continuous rising global temperatures.
Methane Emissions in Agriculture
Used in manufacturing, industrial processes, and agriculture – high GWP pollutants such as methane contribute a significant amount to the current rise in global temperatures.
However, methane emissions continue to persist – with agriculture accounting for 32% of methane emissions as a result of tending to livestock and manure.
💡 Studies show that methane, while more potent than carbon dioxide, can break down within a decade – whereas CO₂ can remain in the atmosphere for centuries.
Therefore, there would be a pivotal change in global warming if we made an increased effort to reduce methane emissions in the near-term to remain aligned with our current path to refrain from exceeding 1.5°C.
HCFCs in Manufacturing
High GWP isn’t just applicable in agriculture, but also for several industrial processes – such as in air conditioning units and refrigerators.
💡 Did you know that phasing out the use of HCFCs could help to prevent the planet from warming an additional 0.5 °C by 2100?
HCFCs, also classified as ozone depleting substances, are frequently used for refrigeration and air-conditioning – with the phaseout process for these substances having started only as recently as 2020.
Furthermore, even as these substances are being phased out – many countries partake in the market to recycle HCFCs for further use. This demonstrates our perilous dependence on ODS and our dire need to find lower GWP alternatives.
Low GWP for Refrigeration
Luckily, there is a growing cognizance in regards to the existence of low GWP refrigerants – such as with HFOs including R-1234yf, R-1234ze and R1233zd.
This transition to the use of low GWP refrigeration could help to reduce the environmental impact created by many consumerism based industries in the United States – such as the air conditioning used at industrial facilities or shopping malls.
👉 Ultimately, pollutants with a high GWP are unknowingly used in our everyday lives – making reducing their usage a key aspect in our global fight against climate change.
How can we avoid and reduce substances with a high Global Warming Potential (GWP)?
We can make a difference in the amount of high GWP substances present in our atmosphere by working to reduce methane emissions, such as by making changes to our current agriculture set up and improving legislation.
Here are some ways we could avoid and reduce the impact created by high GWP pollutants:
- New Approaches to Agriculture – Subject to some of the highest methane emissions of all time, developing new methods to utilize technology or climate smart farming will be pivotal in reduce the amount of greenhouse gas emissions created by agriculture.
- More Proactive Legislation – The process for phasing out of harmful HCFCs only started in the United States as recently as 2020, demonstrating how much of the world is behind in implementing the proper legislation to prohibit the use of the detrimental substances. This could be done by providing more financial incentives for businesses such as with the Inflation Reduction Act of 2022 or through agreements such as the Montreal Protocol.
- Switch to Low GWP Substances – As new substances are being used to reduce the impact of air conditioners, more businesses could switch over to the use of low GWP pollutants such as ammonia and hydrocarbons.
- Improve Energy Efficiency – Companies could invest in more energy efficient vesting HVAC systems to reduce their consistent use of high GWP substances, as improved design and energy efficiency could lead to both improved insulation whilst also mitigating the need for high GWP refrigerants.
Overall, Global Warming Potential (GWP) allows us to better understand how individual substances can have an impact on our environment and subsequent global warming – all while providing us with potential solutions to kick climate change to the curb.
What About Greenly?
If reading this article about Global Warming Potential (GWP) has made you interested in reducing your carbon emissions to further fight against climate change – Greenly can help you!
Making an effort to switch your company over to the values of a green business can be overwhelming, but don’t worry – Greenly is here to help. Click here to schedule a demo to see how Greenly can help you find ways to improve energy efficiency and decrease the dependency on fossil fuels in your own company.
Greenly can help you make an environmental change for the better, starting with a carbon footprint assessment to know how much carbon emissions your company produces.
Click here to learn more about Greenly and how we can help you reduce your carbon footprint.
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