Carbon Markets as a Policy Instrument for Climate Change Mitigation: Evolution, Challenges and Future Perspectives

Abstract

Carbon markets have become one of the most widely adopted market-based instruments for mitigating greenhouse gas emissions and promoting cost-effective climate policies. By assigning an economic value to carbon emissions, these mechanisms create financial incentives for firms and governments to reduce emissions while maintaining economic efficiency. Since the adoption of the Kyoto Protocol in 1997, emissions trading systems and carbon offset mechanisms have expanded significantly across developed and emerging economies. By 2021, more than sixty carbon pricing initiatives had been implemented worldwide, covering approximately one-fifth of global greenhouse gas emissions.

Despite their growing relevance, carbon markets continue to generate intense academic debate regarding their environmental effectiveness, market efficiency, distributional impacts, and institutional governance. Supporters argue that emissions trading systems provide flexibility, stimulate technological innovation, and achieve emission reductions at lower costs than traditional command-and-control regulation. Critics, however, question the adequacy of carbon prices, the allocation of emission permits, price volatility, additionality of offsets, and the risk of carbon leakage across jurisdictions.

This article provides a comprehensive review of the evolution of carbon markets from both theoretical and practical perspectives. The study analyses the economic foundations of carbon pricing, examines the development of compliance and voluntary carbon markets, and evaluates the performance of the main international carbon trading schemes implemented before ending 2021. Particular attention is devoted to the European Union Emissions Trading System (EU ETS), the California Cap-and-Trade Program, and mechanisms established under the Kyoto Protocol.

The paper also discusses the principal challenges facing carbon markets, including governance issues, transparency, market integrity, and international coordination under Article 6 of the Paris Agreement. Finally, the article identifies future research directions and policy recommendations aimed at improving the effectiveness of carbon markets as instruments for achieving global decarbonization objectives.