Climate and Carbon Glossary for Responsible Offsetting
We created this Climate and Carbon Glossary for understanding climate science and carbon markets. It is essential for making responsible choices and taking climate action with Coffset. This comprehensive glossary defines key terms and concepts you’ll encounter on your journey to reduce and offset your carbon footprint. Each definition is written in clear, approachable language and includes direct hyperlinks to authoritative resources for deeper learning.
2026 Update
Several glossary entries in this article have taken on sharper legal and technical meaning over the past year, and it is worth flagging the most significant shifts. The term "corresponding adjustment" has moved from technical footnote to front-page concern: under Article 6.4 of the Paris Agreement, the international crediting mechanism formally began issuing credits in late 2024, and host countries are now expected to apply corresponding adjustments to authorised credits to prevent double-counting. If a credit you purchase does not carry a corresponding adjustment, it may not be considered internationally transferred mitigation outcome (ITMO)-compliant — a distinction your procurement team needs to understand before signing any cross-border offset agreement. Meanwhile, the ICVCM's Core Carbon Principles label, now applied to approved methodologies from several major standards including Verra's VM0042 and Gold Standard's TPDD, has made "high-integrity credit" a more precise phrase than it was even eighteen months ago. When this glossary describes additionality or permanence, readers should know that the CCP label now operationalises those concepts through specific threshold tests, not just principles.
On the reporting side, CSRD and its accompanying ESRS standards have made the distinction between "Scope 1/2/3 reduction" and "offsetting" a compliance matter rather than a communications choice for thousands of European companies whose first full reporting cycles fall in 2025–2026. The glossary entry on "net zero" is particularly worth revisiting in this context: under ESRS E1, residual emissions offset through carbon credits must be disclosed separately from emissions reductions, and the word "neutralisation" is now preferred over "offset" in several corporate reporting frameworks to reflect that credits address what remains, not what was avoided.
Finally, the composition of the voluntary carbon market itself has shifted the weight of certain terms. "Carbon removal" and "carbon dioxide removal (CDR)" now describe a meaningfully larger share of transacted credits than in 2022, driven by growth in biochar, enhanced weathering, and DACCS projects. Where this glossary treats removal and avoidance credits as near-synonyms in terms of offsetting value, that framing is increasingly contested — both by the Science Based Targets initiative's updated guidance and by buyers who are explicitly ring-fencing removal credits for hard-to-abate residuals.
Table of Contents
1. Climate Science Terms
Climate Change
Long-term shifts in temperatures and weather patterns, mainly caused by human activities such as burning fossil fuels and deforestation. Learn more at the IPCC’s explanation.
Greenhouse Gases (GHGs)
Gases in the atmosphere that trap heat and cause Earth’s temperature to rise. The most important are carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), and certain fluorinated gases. See the EPA’s GHG page.
Global Warming Potential (GWP)
A measure that compares the heat-trapping ability of different greenhouse gases over a specific time (typically 100 years) to carbon dioxide. Read the IPCC’s GWP definition.
Net Zero
A state in which greenhouse gas emissions are balanced by removals, so no additional warming occurs. The Oxford Net Zero Initiative has more details.
Mitigation
Any action taken to reduce or prevent greenhouse gas emissions, slowing climate change. Explore Our World in Data’s mitigation overview.
2. Carbon Footprint & Emissions
Carbon Footprint
The total amount of greenhouse gases produced directly and indirectly by a person, organization, or product, measured in CO₂ equivalents. Measure yours with the Coffset Carbon Footprint Calculator.
CO₂ Equivalent (CO₂e)
A standard measure that expresses all greenhouse gases in terms of the amount of CO₂ that would have the same global warming impact. Learn more on Our World in Data.
Scopes (1, 2, 3)
Categories of emissions defined by the Greenhouse Gas Protocol:
- Scope 1: Direct emissions from owned or controlled sources.
- Scope 2: Indirect emissions from purchased energy.
- Scope 3: All other indirect emissions in the value chain.
Per Capita Emissions
The average carbon footprint per person within a country or region. Compare global averages on Our World in Data.
3. Carbon Offsetting & Markets
Carbon Offsetting
Funding projects that reduce, avoid, or remove greenhouse gas emissions to balance your own footprint. Learn more at the MIT Climate Portal.
Carbon Credit
A tradable certificate representing one tonne of CO₂e reduced or removed from the atmosphere. Find out more from Verra’s carbon credit overview.
Additionality
A project’s climate benefit that would not happen without carbon offset finance—a core criterion for high-integrity offsets (Gold Standard on additionality).
Retirement
The process of permanently removing a carbon credit from the market to ensure it cannot be reused or double-counted (Verra’s retirement system).
Carbon Market
A system for buying and selling carbon credits to incentivize emissions reductions. For details, see Carbon Market Watch.
4. Offset Project Types
Reforestation / Afforestation
Planting trees or restoring forests to absorb CO₂ and support biodiversity (Nature Conservancy).
Renewable Energy
Projects that generate clean energy (solar, wind, hydro) and displace fossil fuels (Gold Standard’s renewables).
Methane Capture
Reducing methane emissions from landfills, agriculture, or waste treatment (ClimateCare methane projects).
Clean Cookstoves
Providing efficient stoves to cut emissions and improve health for families in developing regions (ClimateCare cookstove initiatives).
Verified Community-Based Projects
Projects that create climate benefit while supporting health, education, and livelihoods (Plan Vivo).
5. Standards & Verification
Verified Carbon Standard (VCS)
A leading global benchmark for offset project verification (Verra VCS).
Gold Standard
A premium certification focused on both climate and sustainable development impacts (Gold Standard overview).
Clean Development Mechanism (CDM)
A United Nations standard for emission reduction projects in developing countries (CDM).
Registry
An official online database that tracks ownership, retirement, and transparency of carbon credits (Verra registry).
6. Sustainable Living & Actions
Energy Efficiency
Reducing energy waste with efficient appliances, LEDs, insulation, and smart controls (EPA energy efficiency tips).
Green Tariff
A utility plan that supplies electricity from renewable sources (EU Green Tariff explanation).
Plant-Forward Diet
Eating more plant-based foods to lower your personal emissions (Our World in Data on food emissions).
Circular Economy
Keeping products and resources in use through repair, recycling, and reuse (Ellen MacArthur Foundation).
7. Frequently Asked Questions (FAQs)
What is a carbon offset?
A carbon offset is funding for a project that reduces or removes a tonne of CO₂e elsewhere to balance your own emissions. Learn more at the MIT Climate Portal.
How do I reduce my carbon footprint?
Start by switching to renewable energy, improving home efficiency, driving less, and choosing plant-based foods. Calculate your impact and get personalized tips with the Coffset Carbon Footprint Calculator.
Why should I use verified carbon credits?
Verified credits meet strict standards for additionality, transparency, and real climate benefit. Choose credits certified by the Verified Carbon Standard or Gold Standard.
Can I achieve “net zero” with Coffset?
Yes. First, reduce your emissions with sustainable changes. Then, offset any remainder using high-quality, verified projects through Coffset’s platform.
8. Take Action:
Ready to make your carbon footprint matter? Start with our Coffset Carbon Footprint Calculator, explore verified offset projects, and join the movement toward real climate impact
To better understand how carbon footprints relate to offsetting, explore Basics of Carbon Emissions and Offsetting and bust common misconceptions in 7 Myths About Carbon Offsetting. If you want to track your own impact more precisely, check out How to Calculate Your Carbon Footprint and compare tools in Top 5 Carbon Calculators Compared. Ready to take action? Our guides like 10 Simple Ways to Reduce Your Carbon Footprint and Sustainable Living: 5 Habits offer practical tips to cut emissions daily.
9. Learn More
?Frequently Asked Questions
Put your knowledge into action
Calculate your footprint and offset instantly with verified credits.
Continue reading
8 Proven Modules: Carbon Literacy for Educators — Teaching Climate Solutions
A comprehensive blueprint for schools and universities featuring 8 accredited Carbon Literacy modules designed specifically for educators. Includes ready-to-teach toolkits, action-based assessments, and current climate indicators.
9 Proven Steps: Climate Change Economics — Carbon Pricing & Market Mechanisms
Learn the fundamentals of carbon pricing through 9 proven steps covering carbon tax vs cap-and-trade systems, EU ETS, CBAM, and high-integrity credits. Essential guidance for businesses and policymakers navigating climate economics.
Behavioral Economics for Carbon Reduction
Discover how behavioral science transforms carbon reduction efforts through social comparisons, feedback systems, and goal setting strategies that work at scale.