Good practice is to identify the appropriate method for estimating emissions for each source category, and then base the characterisation on the most detailed requirements identified for each livestock species. The livestock characterisation used by a country will probably undergo iterations as the needs of each source category are assessed during the emissions estimation process (see Figure 10.1, Decision Tree for Livestock Population Characterisation). The steps are:
• Identify livestock species applicable to each emission source category: The livestock species that contribute to more than one emission source category should first be listed. These species are typically: cattle, buffalo, sheep, goats, swine, horses, camels, mules/asses, and poultry.
• Review the emission estimation method for each relevant source category: For the source categories of Enteric Fermentation and Manure Management, identify the emission estimating method for each species for that source category. For example, enteric fermentation emissions from cattle, buffalo, and sheep should each be examined to assess whether the trend or level of emissions warrant a Tier 2 or Tier 3 emissions estimate. Similarly, manure management methane emissions from cattle, buffalo, swine, and poultry should be examined to determine whether the Tier 2 or Tier 3 emissions estimate is appropriate. Existing inventory estimates can be used to conduct this assessment. If no inventory has been developed to date, Tier 1 emission estimates should be calculated to provide initial estimates for conducting this assessment. See Volume 1, Chapter 4 (Methodological Choice and Identification of Key Categories) for guidance on the general issues of methodological choice.
• Identify the most detailed characterisation required for each livestock species: Based on the assessments for each species under each source category, identify the most detailed characterisation required to support each emissions estimate for each species. Typically, the 'Basic' characterisation can be used across all relevant source categories if the enteric fermentation and manure sources are both estimated with their Tier 1 methods. An 'Enhanced' characterisation should be used to estimate emissions across all the relevant sources if the Tier 2 method is used for either enteric fermentation or manure.
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