Changes in version 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).

                 Changes in version 0.1.0 (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