Access Carbon Market Data from Emissions Trading Systems and Voluntary Registries R package carbondata version 0.1.0 Unified access to carbon market data from compliance emissions trading systems ('EU ETS', 'UK ETS', 'RGGI', California Cap-and-Trade) and voluntary carbon markets (Verra, Gold Standard, American Carbon Registry, Climate Action Reserve, via the Berkeley Voluntary Registry Offsets Database and the 'CarbonPlan' 'OffsetsDB' API). Includes cross-market price data from the 'International Carbon Action Partnership' ('ICAP') Allowance Price Explorer <https://icapcarbonaction.com/en/ets-prices>, global carbon pricing from the World Bank Carbon Pricing Dashboard <https://carbonpricingdashboard.worldbank.org/>, and the historical 'RFF' World Carbon Pricing Database following Dolphin, Pollitt and Newbery (2020) <doi:10.1038/s41597-022-01659-x>. Data is downloaded from public sources on first use and cached locally. Software Depends: R (>= 4.1.0) Imports: cli (>= 3.6.0), httr2 (>= 1.0.0), jsonlite, readxl, tools, utils Suggests: arrow, nanoparquet, testthat (>= 3.0.0) Charles Coverdale <charlesfcoverdale@gmail.com> Comprehensive R Archive Network (CRAN) Charles Coverdale [aut, cre] MIT + file LICENSE (https://CRAN.R-project.org/package=carbondata/LICENSE) 2026-04-21 application/tgz https://CRAN.R-project.org/package=carbondata doi:10.32614/CRAN.package.carbondata en-US