carbondata 0.1.0

• 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