Explanation

The Common Carbon Metric (CCM) was created by the UNEP Sustainable Buildings and Climate Initiative (UNEP-SBCI) in partnership with global building sector experts.

– Buildings account for nearly 40% of global energy consumption and over one-third of total greenhouse gas emissions.
– The Common Carbon Metric serves as an internationally standardized protocol for measuring, calculating, and reporting energy consumption and operational GHG emissions from building stocks.
– It establishes uniform metrics (such as emissions per square meter and emissions per occupant) to enable cross-border comparisons, establish baseline benchmarks, and monitor climate mitigation efforts across global built infrastructure.

Therefore, the correct choice is Option A.