The 'Common Carbon Metric', supported by UNEP, has been developed for

1. The 'Common Carbon Metric' (CCM) is a protocol developed for measuring energy use and reporting greenhouse gas emissions specifically from building operations. 2. It is supported by the United Nations Environment Programme (UNEP) through its Sustainable Buildings and Climate Initiative (SBCI). 3. Option (A) accurately describes its purpose: 'assessing the carbon footprint of building operations around the world'. It aims to provide a consistent global methodology for this assessment. 4. Option (B) is incorrect; CCM is not related to commercial farming or carbon emission trading. 5. Option (C) is incorrect; while related to carbon footprint, CCM is specific to buildings, not the overall carbon footprint of countries. 6. Option (D) is incorrect; CCM focuses on building operations, not the total global footprint from fossil fuels.