Web app Regensburg Model:
Calculation of Paris-compatible emission paths with converging per capita emissions
In the Regensburg Model, national emission paths are derived from a global emission path using the Regensburg Formula which leads to converging per capita emissions.
In the Regensburg Model, six scenario types (RM 1 - 6) are offered to derive global emission paths that adhere to a predefined CO2 budget. Here is a brief description of the scenario types.
Important framework data in the following web app (these can be freely set in the detailed Excel tool; see below):
► Global CO2 budget 2020 - 2100: 400 Gt, 550 Gt or 650 Gt (see indication in the app)
► Separate CO2 budgets at global level 2020 - 2100:
- Land-use change (LUC): 0 Gt
- International shipping and aviation (ISA): 3% of the global remaining budget
► Minimum global CO2 emissions by 2100: -0.7 Gt
► Convergence level: 0.5 t per capita
When you select a country, you can see the resulting emission paths, reference values and other key figures.
In the corresponding tab you can see the underlayed global paths.
Note:
- The emission paths cover CO2 emissions from fossil fuel use (excluding international shipping and aviation; ISA) and cement production. ISA and land-use change (LUC) are therefore not covered. Budgets are reserved for these two fractions at the global level.
- Since a budget of zero Gt has been set for LUC, net negative CO2 emissions must be realised in the LUC sector to offset the current net positive CO2 emissions in this area.
- CO2 neutrality must be achieved before climate neutrality, as net negative CO2 emissions are required to offset, for example, unavoidable methane and nitrous oxide emissions from agriculture. These net negative CO2 emissions must be provided in addition to the net negative CO2 emissions (overshoot) shown here.
Detailed Excel tool
You can download the detailed Excel tool at: https://doi.org/10.5281/zenodo.5846043.
Here are the instructions for the Excel tool with further background information.
Some publications on the Regensburg Model
► The Regensburg Model: reference values for the (I)NDCs based on converging per capita emissions, journal 'climate policy', 
; published 2016
► Calculation of Paris-compatible emission targets for the six largest emitters with the Regensburg Model, 2022, ; published on Zenodo
Global remaing CO2 budgets
Here are key statements by the IPCC on remaining global CO2 budgets.