What are Carbon Credits and How Do They Work?

Carbon credits have become a cornerstone of corporate climate strategy, but many businesses still struggle to understand what they are, how they function, and whether they should feature in their decarbonization roadmap. As climate commitments intensify and regulatory frameworks like CSRD in Europe and GHG Protocol in India demand more robust emissions reporting, clarity around carbon credits is essential.

This guide explains carbon credits from first principles - what they represent, how they're created, which quality standards matter, and when your business should consider purchasing them.

What is a Carbon Credit - Definition and Basics

A carbon credit is a transferable financial instrument that represents a verified reduction or removal of one tonne of carbon dioxide equivalent (CO₂e) from the atmosphere. This is the fundamental unit of the carbon market.

The Core Concept

Think of a carbon credit as a commodity with environmental value. Each credit certifies that:

• One tonne of CO₂e has been either avoided (prevented from entering the atmosphere) or removed (extracted from the air)
• The reduction or removal has been measured, verified, and issued by an independent third party
• The credit can now be bought, sold, or retired (permanently canceled) by a company or individual claiming the emissions reduction

A company that reduces its emissions by 500 tonnes of CO₂e generates 500 tradeable credits. A buyer purchasing those 500 credits can use them to offset an equivalent amount of their own emissions.

Retired vs. Traded Credits

Credits are either traded (bought and sold on carbon markets) or retired. Once retired, a credit cannot be traded again - it's permanently removed from circulation to represent a real, one-time environmental benefit.

Voluntary Carbon Markets vs Compliance Markets

Carbon credits operate in two distinct ecosystems, each with different drivers, pricing, and regulatory oversight.

Voluntary Carbon Markets (VCM)

The voluntary market is where companies, nonprofits, and individuals choose to purchase credits to offset emissions or meet internal sustainability targets. Key characteristics:

• Buyers are not legally mandated to participate
• Credits are typically cheaper than compliance credits (often USD 5-20 per tonne)
• Lower regulatory oversight, though quality standards exist
• Wide variety of project types (renewable energy, forestry, methane capture)
• Buyer motivation is often reputational or aligned with net-zero commitments

Compliance Carbon Markets

Compliance markets exist because governments have passed carbon pricing laws. Regulated entities must purchase credits to cover emissions they cannot reduce internally. Examples include:

• EU Emissions Trading System (ETS)
• UK Emissions Trading Scheme (ETS)
• China's national carbon market
• India's Carbon Credit Trading Scheme (CCTS)

Compliance credits are typically much more expensive (often EUR 50-100+ per tonne) because participation is mandatory. These markets are heavily regulated and closely monitored.

How Carbon Credits are Generated - Key Project Types

Carbon credits originate from specific environmental projects that reduce or remove emissions. Understanding the main categories helps businesses assess credit quality and legitimacy.

Renewable Energy Projects

Wind farms, solar installations, and hydroelectric schemes displace fossil fuel-based electricity generation. Each megawatt-hour of clean energy produced can generate credits based on the emissions that would have been created by burning coal or gas.

Forestry and Land Use Projects

Reforestation, avoided deforestation, and sustainable forest management projects sequester carbon dioxide as trees grow. These credits are popular in voluntary markets but face scrutiny around permanence - will the forest survive long-term?

Soil Carbon and Agriculture

Conservation tillage, rotational grazing, and other farming practices increase carbon stored in soil. Agricultural carbon credits are growing but require rigorous measurement protocols to verify claimed sequestration.

Methane Capture and Destruction

Landfill gas recovery and livestock methane reduction projects prevent potent greenhouse gases from entering the atmosphere. Methane is 28-36 times more powerful than CO₂ over a 100-year period, making these projects high-impact.

Energy Efficiency and Industrial Processes

Factory upgrades, waste heat recovery, and process improvements that reduce energy consumption all generate credits proportional to avoided emissions.

Key Quality Standards for Carbon Credits

Not all carbon credits are equal. Quality standards ensure credits represent real, measurable, additional, and permanent emissions reductions.

Gold Standard

Developed by the World Wildlife Fund and other NGOs, Gold Standard is the most rigorous voluntary market standard. It requires:

• Verified emissions reductions
• Sustainable development co-benefits (poverty reduction, clean water, etc.)
• Permanent carbon removal (where applicable)
• Independent third-party audits

Gold Standard credits command premium prices (often USD 15-30) because buyers trust their integrity.

Verified Carbon Standard (VCS)

VCS (now part of Verra) is the largest voluntary market standard by volume. It emphasizes:

• Additionality - proving the project would not have happened without carbon finance
• Permanence - for removal-based credits
• No double-counting across jurisdictions

Clean Development Mechanism (CDM)

The CDM operated under the Kyoto Protocol and issued credits for emissions reduction projects in developing countries. Many CDM credits still trade today, though new issuance has slowed.

India's Carbon Credit Trading Scheme (CCTS)

India's compliance market uses the CCTS, established under the Energy Conservation Act. It covers large energy-consuming industries and generates credits through verified energy efficiency improvements. Learn more about How CCTS Works in India and its unique verification requirements.

Should Businesses Buy Carbon Credits?

Carbon credits serve a specific purpose - they address residual emissions that a company cannot eliminate through direct operational improvements.

When Credits Make Strategic Sense

• Your organization has already reduced emissions from energy, transport, and waste
• You have a net-zero or carbon-neutral target requiring rapid progress
• Offsetting specific, hard-to-abate emissions (Scope 3, business travel)
• Demonstrating interim climate leadership while long-term decarbonization unfolds
• Complying with mandatory carbon pricing (as in the CCTS or EU ETS)

When Credits are Insufficient

Purchasing credits should never replace operational decarbonization. Regulators, investors, and credible carbon frameworks all expect:

• Primary focus on reducing your own emissions
• Credits used only for truly residual, unavoidable emissions
• Preference for high-quality, Gold Standard or equivalent credits
• Transparent disclosure of which emissions are offset vs. reduced

Understand the distinction between Net Zero vs Carbon Neutral approaches - net zero typically requires deeper emissions cuts, not just offsetting.

FAQ

What exactly is one carbon credit worth?

One carbon credit represents exactly one tonne of CO₂e avoided or removed. The financial value varies widely: voluntary market credits range from USD 5-30, while compliance credits (EU ETS, CCTS) can exceed USD 100 per tonne.

How do I verify that a carbon credit is real?

Look for credits issued by recognized standards: Gold Standard, Verra (VCS), CDM, or national programs like India's CCTS. Check the project registry, review independent audit reports, and verify the credit has not been double-counted or previously retired.

Can we rely solely on carbon credits to meet our net-zero target?

No. Credible net-zero commitments (aligned with science-based targets) require at least 90% of emissions reductions from direct operational improvements. Credits should only cover residual emissions that cannot be abated through efficiency, renewable energy, or process changes.

Is the voluntary carbon market regulated?

The voluntary carbon market is less regulated than compliance markets but is not unregulated. Standards like Gold Standard and Verra enforce strict methodologies, independent audits, and registry systems. However, quality varies, and due diligence is essential.

When should a business buy compliance credits vs voluntary credits?

If your industry is covered by a mandatory carbon pricing scheme (EU ETS, UK ETS, India's CCTS), you must purchase compliance credits. For emissions outside mandatory schemes or interim offset strategies, voluntary credits offer more flexibility and project variety.

Conclusion

Carbon credits are a legitimate tool in the climate toolkit, but they are not a substitute for reducing emissions. One tonne of CO₂e avoided or removed equals one credit - a measurable, tradeable unit with real environmental value when sourced from quality-assured projects.

Businesses should understand the difference between voluntary and compliance markets, recognize that Gold Standard and CCTS-equivalent standards ensure integrity, and ensure credits address only residual emissions after direct reductions have been maximized.

As regulations tighten globally - from CSRD in Europe to BRSR in India and CCTS compliance across sectors - carbon accounting and credit strategy will become integral to financial reporting and stakeholder trust. Platforms like Greenio help organizations track both emissions reductions and credit portfolios with the accuracy and transparency that regulators and investors now demand.