To be fully compliant a city needs to develop a greenhouse inventory using the GPC standards and provide a climate hazards and risk assessment.
(A). Mitigation compliance requirements
- GPC inventory
City-wide GHG emission inventories need to meet the reporting requirements set out in the Global Protocol for Community-scale GHG emissions (GPC). Cities are recommended to use the carbon Climate Registry reporting platform which has all appropriate sections available in a simple to use worksheet.
The following data needs to be provided:
Inventory year (defined as a continuous 12-month period) however the inventory year may be no more than three years prior to the reporting year
Geographic boundary (spatial dimension or physical perimeter)
Land area (in km2)
City GDP (in US$)
Emission data needs to be reported by sub-sector and scope, and in metric tonnes of CO2e (carbon dioxide equivalents) as set out in the Carbonn climate registry worksheets ( example of Carbonn worksheets here) .
Within 1 year, cities must report emissions from stationary energy and in boundary travel in as many sectors as possible.
Reporting by individual GHG is recommended in year 1 however the minimum acceptable form is CO2E in metric tonnes.
Within year 1 the requirement is emissions data is from Stationary energy (residential, industrial and commercial sectors) and in boundary transport
In year Waste reporting is optional. however a city’s emissions report on waste in year one can be for equivalent carbon dioxide (CO2) only
The activity data underpinning the GHG inventory must be disclosed and reported within 2 years.
Within 3 years a BASIC inventory is required which covers Stationary Energy, Inbound travel and waste by scope 1 and 2.
Within 3 years a city report must include reporting on 3 gases, carbon dioxide (CO2) methane (CH4) and nitrous oxide (N2O).
The activity data underpinning the GHG inventory must be disclosed and reported with this inventory.
Cities are, however, strongly encouraged to report emissions from all three sectors ( Stationary energy, transportation and waste) and all relevant sub sectors if available as soon as they are able to.
In general cities are strongly encouraged to report emissions of all three major GHGs ( CO2, CH4, N2O) as soon as they are able to. Additional GHGs are optional: HFCs, PFCs, SF6 and NF3.
Additional activities are optional: eg. transboundary travel, industrial processes and product use (IPPU) and agriculture, forestry and land use (AFOLU).
Notation keys will be used to accommodate limitations in data availability and differences in emission sources between reporting cities. The notation Key “NE”, which means not estimated, will not be accepted for any mandatory emission sources.
A data quality assessment (for activity data and emissions factors) should be conducted. Where incomplete data, a default value of “low” is applied. The Carbonn worksheets will guide the user to fill in all compulsory fields including notation keys.
Supportive activity data
To arrive at the GPC inventory calculations will need to be made using relevant emissions factors, coeffcients and formulae concerning the fossil fuels used or waste and other emissions.
Detailing the sources of foundation reports and /or calculations for stationary energy, transport, waste and other sectors is required. At least three gases breakdown will be required.
(B) Adaptation compliance requirements
Covenant of Mayors compliance for adaptation requires that participating cities undertake a program of climate change risk and vulnerability assessment and adaptation planning within a three year period of joining the compact.
- Hazards reporting
Within the first year cities must report on both the current and future climate hazards that they face.
The carbonn Climate Registry reporting platforms include questions that allow cities to nominate the current and future hazard they face using the terminology of the City Climate Hazard Taxonomy. This can be completed on the carbonn reporting worksheets.
- Vulnerability assessment
Cities must conduct a climate change risk and/or vulnerability assessment within two years of joining.
A climate change risk assessment is a qualitative and/or quantitative scientific estimation of risks due to climate change. Climate change risks are usually defined as the potential for consequences where something of human value (including humans themselves) is at stake and where the outcomes is uncertain.
Climate change risk is often represented as the probability of occurrence of hazardous climate events, or trends multiplied by the consequence of these events occur.
A climate change vulnerability assessment is a qualitative and/or quantitative assessment of the degree to which a system is susceptible to, or unable to cope with, adverse effects of climate change, including climate variability and extremes.
Vulnerability is a function of the character, magnitude, and rate of climate variation to which a system is exposed, its sensitivity, and its adaptive capacity.
To be compliant a city climate change risk and/or vulnerability assessment must consider both current and future climate conditions.