Changelog

Source: NEWS.md

carbondata 0.1.1

CRAN policy compliance pass. No functional API changes.

• Converted 14 of 17 \dontrun{} roxygen examples to \donttest{}. These examples wrap public, unauthenticated data fetches from ‘UK ETS’, ‘RGGI’, California Cap-and-Trade, ‘ICAP’, World Bank, ‘RFF’, Berkeley VROD, and ‘CarbonPlan OffsetsDB’. Each converted example now also sets options(carbondata.cache_dir = tempdir()) around the call and restores the prior value afterwards, so running the example on CRAN does not write to the user’s home filespace.
• co2_offsets_db() example now guards the arrow::read_parquet() call with requireNamespace("arrow", quietly = TRUE) so the example does not error when arrow (in Suggests) is not installed.
• Three \dontrun{} remain:
  • co2_euets_emissions() and co2_euets_allocations(): DG CLIMA wide-format file schema drifted in 2026, so these functions currently abort. Marked \dontrun{} with a comment pending a parser update.
  • co2_cad_trust(): placeholder that always aborts (CAD Trust has no unauthenticated public API).

carbondata 0.1.0

CRAN release: 2026-04-21

• Initial CRAN release.

EU Emissions Trading System (5 functions)

• co2_euets_emissions() fetches verified greenhouse-gas emissions by installation and year from the European Environment Agency.
• co2_euets_allocations() fetches free allowance allocations.
• co2_euets_surrendered() fetches surrendered units per installation per year.
• co2_euets_price() fetches EUA auction settlement prices from EEX public reports.
• co2_euets_installations() returns the EU ETS installation registry.

Other compliance markets (3 functions)

• co2_ukets() fetches UK ETS prices, verified emissions, and allocations.
• co2_rggi() fetches RGGI auction prices, quarterly emissions, and allowance distribution from the COATS system.
• co2_california() fetches California Cap-and-Trade auction settlement prices, emissions, and auction volumes.

Cross-market aggregators (3 functions)

• co2_icap_prices() fetches the ICAP Allowance Price Explorer dataset covering 20+ ETS jurisdictions globally.
• co2_world_bank() fetches the World Bank Carbon Pricing Dashboard (carbon taxes + ETS, 70+ initiatives).
• co2_rff_pricing() fetches the RFF World Carbon Pricing Database (Dolphin, Pollitt, Newbery 2020).

Voluntary markets (3 functions)

• co2_vrod() fetches the Berkeley Voluntary Registry Offsets Database aggregating Verra, Gold Standard, ACR, CAR, and ART TREES.
• co2_offsets_db() queries the CarbonPlan OffsetsDB REST API.
• co2_cad_trust() queries the Climate Action Data Trust (CAD Trust) API for Article 6-aligned carbon credit metadata.

Helpers (3 functions)

• co2_markets() lists all supported markets with coverage metadata.
• co2_clear_cache() empties the local download cache.
• co2_cache_info() reports what is cached and how much space it uses.

Deferred to v0.2.0

• New Zealand ETS, Korea ETS, China national and pilot ETS
• Direct Verra / Gold Standard / Puro.earth registry scraping
• Rating provider integrations (Sylvera, BeZero, MSCI)
• Intraday carbon prices