The methodologies issues by the GHG Protocol are employed for the assessment of greenhouse gas emissions & energy consumption for specific ICT products, while covering the entire life cycle. 

The types of GHG methodologies are:

1. GHG Protocol Product Lyfe Cycle Accounting and Reporting Standard ICT Sector Guidance - Chapter 2 - Guide for assessing GHG emissions Telecommunications Network Services
2. GHG Protocol Product Life Cycle Accounting and Reporting Standard ICT Sector Guidance - Chapter 3 - Guide for assessing GHG emissions of Desktop Managed Services
3. GHG Protocol Product Life Cycle Accounting and Reporting Standard ICT Sector Guidance - Chapter 5 - Guide for assessing GHG emissions of Cloud Computing and Data Center Services
4. GHG Protocol Product Life Cycle Accounting and Reporting Standard ICT Sector Guidance - Chapter 6 - Guide for assessing GHG emissions of Hardware
5. GHG Protocol Product Life Cycle Accounting and Reporting Standard ICT Sector Guidance - Chapter 7 - Guide for assessing GHG emissions of Software

For more information about the GHG Methodologies go to: www.ghgprotocol.org/