Amount of greenhouse gases (GHG) emitted through the organization's operations during the reporting period.
Organizations should footnote all assumptions used including detailed information on their calculation methodology. See usage guidance for further information.
This metric is intended to capture the total amount of greenhouse gases emitted during the reporting period. To disaggregate types of greenhouse gas emissions, organizations are encouraged to report Greenhouse Gas Emissions Scopes (OI5732), which allows for disaggregation by GHG Protocol Scopes 1-3. For tools that may be helpful in calculating this and related metrics see GHG Protocol Calculators.
Organizations can also report Greenhouse Gas Emissions Strategy (OI8237). This should include emissions from both direct and indirect sources.
In some contexts, this metric can serve as an indicator of whether the outcome being sought by an investor or organization is occurring (the WHAT dimension of impact). For more on the alignment of IRIS metrics to the five dimensions of impact, see IRIS+ and the Five Dimensions of Impact. No single metric is sufficient to understand an impact; rather, metrics are selected as a set across all dimensions of impact. When possible, the selection of metrics to measure and describe the five dimensions should be based on best practice and evidence.
Metrics identified as "cross-category" are those that are relevant to any IRIS+ Impact Category or Impact Theme (i.e., these metrics are not specific to any particular industry/category or theme).
Greenhouse Gas Emissions: Total (OI1479) is required for Joint Impact Indicator: GHG Emissions.
JII definition: Amount of GHG emissions emitted during the reporting period, measured in tons. Project-level emissions information provided by client can be used to calculate derivative indicators (e.g. emissions savings/reduction/avoidance) according to the most relevant methodology.
JII unit of measurement: t (CO2e)
December 2019 - IRIS v5.1 Released
Immaterial change. Edited definition, usage guidance, and tagging.
April 2019 - IRIS v5.0 Released
February 2016 - IRIS v4.0 Released
Immaterial change. Minor revision to metric reporting format for clarity.
February 2014 - IRIS v3.0 Released
Immaterial change. Minor revision to metric name and definition language for clarity.
October 2011 - IRIS v2.2 Released
January 2011 - IRIS v2.1 Released
August 2010 - IRIS v2.0 Released
Immaterial change. IRIS ID changed due to framework upgrade. Minor revision to definition language for clarity.
August 2009 - IRIS v1.0 Released
New metric. Greenhouse Gas Emissions (OEN38) developed via Original IRIS Working Group.
IRIS Metrics Work Better in Sets
To use IRIS metrics—and the resulting data—to understand impact performance, IRIS metrics should be used and analyzed in generally accepted sets and according to well-defined objectives. IRIS+ gives you access to generally accepted Core Metrics Sets aligned to common Impact Themes and Sustainable Development Goals (SDGs).