Inventorying the sources of greenhouse gas emissions is the first step to effectively reduce emissions. By understanding the sources of emissions, we can formulate targeted emission reduction measures. This article will comprehensively analyze the six major categories of greenhouse gas inventory and provide examples for each category and its emission sources to help companies and organizations understand the structure and sources of carbon emissions. All content in this document complies with the requirements of ISO 14064-1 or ISO 14067.
Why are greenhouse gas inventories divided into six categories?
The greenhouse gas inventory is divided into six categories in order to more accurately identify and quantify emissions from different sources, which will help to develop more specific and effective emission reduction strategies. These six categories cover all possible sources of emissions, ensuring the comprehensiveness and systematicness of the inventory process.
A brief introduction to the carbon inventory process
The carbon inventory process usually includes the following steps:
- Determine scope and boundaries：Determine the sources and scope of emissions that need to be investigated.
- Data Collection: Collects data related to emissions, including energy use, transportation activities, etc.
- Data Calculation: Use a standardized methodology to calculate greenhouse gas emissions, ensuring that the calculation process complies with ISO 14064-1 or ISO 14067 standards.
- Reporting and Verification: Emissions reports are prepared and verified by a third party to ensure accuracy.
Greenhouse Gas Inventory Category 1: Direct Greenhouse Gas Emissions and Removals
Direct emissions are greenhouse gas emissions that companies generate in the course of their operations, such as carbon dioxide emissions from factories burning fossil fuels.
- example：A certain factory burns coal every year, and a large amount of carbon dioxide is produced during the coal combustion process.
Greenhouse gas inventory category 2: Indirect greenhouse gas emissions from energy input
Indirect emissions from energy input come from emissions generated during the production process of energy purchased by the company (such as electricity and steam).
- example: A company uses a large amount of electricity every year, and the production of this electricity generates indirect emissions.
Greenhouse gas inventory category 3: Indirect greenhouse gas emissions from transportation
Transport emissions cover emissions from the transportation of a company’s products, materials and employee commuting.
- example: A company uses trucks to transport products every year, generating indirect emissions during the transportation process.
Greenhouse gas inventory category 4: indirect greenhouse gas emissions from product use
Indirect emissions from product use refer to emissions generated during the use of products produced by an enterprise.
- example：The electrical products produced by a certain company consume electricity during use and generate indirect emissions.
Greenhouse gas inventory category 5: Indirect greenhouse gas emissions related to product use
Emissions associated with the use of products include other indirect emissions during the product life cycle, such as emissions from the treatment and recycling of discarded products.
- example：A certain company has a large number of discarded electrical products every year, which generate indirect emissions during the recycling process.
Greenhouse gas inventory category 6: other indirect emissions
Other indirect emissions cover all indirect emissions other than the above five categories, such as emissions generated by employee business trips, office operations, etc.
- example: Every year, a company’s employees travel by plane on business, generating indirect emissions during the flight.
Which greenhouse gas inventory categories can be excluded from listing or calculation??
When conducting greenhouse gas inventories, companies can choose not to list or calculate certain emission categories based on actual conditions and industry standards. For example:
- Small-scale Scope 3 emissions (such as employees driving their own cars to and from get off work) may be excluded due to their small quantities.
- Insignificant Category 4 emissions (such as emissions from the use of very few products) may also not be calculated.
- Very small Scope 5 and Scope 6 emissions (such as very small amounts of waste product disposal or small amounts of travel) may be negligible in some circumstances.
The exclusion of these categories should be based on their impact on total emissions and the practical feasibility of inventory and reduction.
Conclusion
A comprehensive greenhouse gas inventory helps companies and organizations identify major emission sources and take effective measures to reduce emissions. By systematically classifying and quantifying emissions, companies can set more precise emissions reduction targets and play a greater role in addressing climate change. The inventory and calculation of all emission sources should comply with the standard requirements of ISO 14064-1 or ISO 14067 to ensure the accuracy and reliability of the data.
Further reading:
iso14064-1 Greenhouse Gas Inventory and Carbon Footprint Inventory
A comprehensive guide to the corporate GHG inventory process! Master the six key points