2.11 Gas Emissions and Emission Calculation

[Audio] Hello Everyone!! This is a lecture for JFB32303 Energy Performance And Environmental Assessment.

[Audio] We will continue subtopic 2.11 in the Chapter 2 Carbon Footprint Analysis.

[Audio] In this chapter, we will learn how to standardize and calculate greenhouse gas emissions. Different greenhouse gases affect the climate in different ways. Therefore, scientists and environmental researchers need a standardized method to measure their impact. This module introduces a step-by-step framework for quantifying greenhouse gas impacts in environmental carbon accounting. Understanding these calculations is important for sustainability studies, environmental policy, and carbon management. Example For instance, industries release different gases such as carbon dioxide, methane, and nitrous oxide. We must convert their impacts into a common unit to compare them..

[Audio] This module focuses on three main learning objectives. Identifying Major Greenhouse Gases Understanding the main gases that contribute to climate change. Understanding Global Warming Potential (GWP) Learning how different gases affect global warming. Calculating CO₂ Equivalent (CO₂e) Converting different greenhouse gases into a standardized measurement. These steps help students understand how environmental scientists measure carbon emissions accurately. Example A factory may emit methane and carbon dioxide. To compare their impacts, we convert them into CO₂ equivalent..

[Audio] There are several greenhouse gases that contribute to global warming. The slide highlights three of the most important ones: Carbon dioxide (CO₂) Methane (CH₄) Nitrous oxide (N₂O) Each of these gases traps heat in the atmosphere and contributes to climate change. However, they do not have the same level of impact. Example Carbon dioxide is commonly produced by burning fossil fuels, while methane is often released from agriculture and landfills..

[Audio] One of the challenges in carbon accounting is that different greenhouse gases trap heat differently. This means that the same physical amount of gas may have very different impacts on the climate. For example, methane and nitrous oxide trap much more heat than carbon dioxide. Because of this difference, scientists need a method to compare these gases fairly. Example One kilogram of methane can cause much more warming than one kilogram of carbon dioxide..

[Audio] To solve this problem, scientists use a metric called Global Warming Potential (GWP). GWP measures how much heat a greenhouse gas traps in the atmosphere compared to carbon dioxide. Carbon dioxide is used as the reference gas, and its GWP value is set to 1. Other gases are measured relative to carbon dioxide. Example If methane traps 28 times more heat than carbon dioxide, its GWP is 28..

[Audio] The slide shows how different greenhouse gases compare in terms of warming potential. Carbon dioxide (CO₂) → GWP = 1 Methane (CH₄) → GWP = 28 Nitrous oxide (N₂O) → GWP = 265 This means that nitrous oxide has a much stronger warming effect than carbon dioxide. Even small amounts of these gases can significantly affect the climate. Example One kilogram of nitrous oxide has the same warming impact as 265 kilograms of carbon dioxide..

[Audio] To compare different greenhouse gases, scientists convert them into CO₂ equivalent (CO₂e). This process uses the Global Warming Potential values. By converting all gases into CO₂ equivalent, we can combine emissions into a single standardized metric. This makes carbon accounting easier and more accurate. Example If a company releases methane and carbon dioxide, both emissions can be converted into CO₂e to determine the total climate impact..

[Audio] The formula for calculating CO₂ equivalent is: CO₂ equivalent = Emission × GWP Where: Emission is the amount of gas released. GWP is the global warming potential of the gas. The result is a standardized climate impact score. Example If a factory releases 10 units of methane, we multiply by its GWP value to calculate the CO₂ equivalent..

[Audio] Let us look at an example using methane. Methane has a Global Warming Potential of 28. If a source emits 1 unit of methane, the CO₂ equivalent is: 1 × 28 = 28 units of CO₂ equivalent. This means methane emissions have a significantly higher warming impact compared to carbon dioxide. Example Methane released from livestock farming contributes strongly to climate change because of its high warming potential..

[Audio] Nitrous oxide has an even higher warming potential. Its GWP value is 265. This means that emitting 1 unit of nitrous oxide is equivalent to 265 units of carbon dioxide. Although nitrous oxide emissions are smaller in quantity, their climate impact is very large. Example Nitrous oxide emissions from agricultural fertilizers can significantly contribute to greenhouse gas emissions..

[Audio] The final slide summarizes the standardization process used in environmental carbon accounting. The table shows the GWP values for the three main gases: Carbon dioxide, CO₂, Global Warming Potential = 1. Methane, CH₄, Global Warming Potential = 28 Nitrous oxide, N₂O, Global Warming Potential = 265 Using these values, emissions can be converted into CO₂ equivalent using the formula: CO₂ equivalent = Emission × GWP This standardized approach allows scientists, governments, and organizations to compare emissions and track climate impact. Example A report may show that a company emits 5,000 tons of CO₂ equivalent per year, combining all greenhouse gas emissions into one standardized value..

[Audio] That's all for now. See you in next time!! Have a good day everyone, Bye!.