fix-build_carbon_budget

[martavp]

In the IPCC 6th Assessment Report, carbon budgets are reported from 2020 onwards.
See Table SPM2 in the Summary for Policymakers
https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_SPM.pdf

Before carbon budgets were reported from 2018 onwards. Substracting emissions in 2018 and 2019 is no longer required.

[fneum]

Does that need a change in the input data as well? (sorry for the delay btw, was on holiday)

[martavp]

No worries. I hope you had a nice holiday :)

We don't need to change the input data.

The carbon budget for a certain pathway is defined in the config file

pypsa-eur-sec/config.default.yaml

Line 35 in 118f06f

# for myopic/perfect foresight cb states the carbon budget in GtCO2 (cumulative

Before the IPCC 6AR was published in August, the IPCC reported global carbon budgets from 2018 onwards, so the script assumed that, when calculating transition from today (2020), 2 years of emissions (2018, 2019) should be discounted.

In the IPCC 6AR, global carbon budgets are assumed from 2020 onwards, so we can assume that in the future these reported carbon budgets will be used and there is no need to discount emissions in 2018 and 2019.

[fneum]

Ah, I see. Thanks!