What Does Net Zero Mean? Definition, Examples and How It Works

Updated: June 2026

Net zero means reducing greenhouse gas emissions as deeply as possible and balancing the small amount of unavoidable emissions with an equivalent amount of greenhouse gas removal.

It does not mean that a country, company or activity produces no emissions at all. It means that the greenhouse gases released into the atmosphere are balanced by removals over a defined period, so that the net addition is zero.

The most important part of reaching net zero is not purchasing offsets. It is preventing emissions through cleaner energy, energy efficiency, electrification, reduced fossil-fuel use, lower methane emissions and changes in transport, industry, buildings, agriculture and land management.

What Does Net Zero Mean?

The Intergovernmental Panel on Climate Change defines net-zero greenhouse gas emissions as a condition in which human-caused greenhouse gas emissions are balanced by human-caused removals over a specified period.

The term can be applied at different scales, including:

• the entire world;
• a country or region;
• a city;
• a company or institution;
• a product or service; or
• an event or activity.

However, the meaning of a net-zero claim depends on what is included within its boundary. A company may claim net zero for its own buildings while excluding emissions from suppliers, transport, product use and waste. A country may count emissions produced within its borders but not all emissions associated with imported goods.

For this reason, any credible net-zero claim should clearly state:

• which greenhouse gases are included;
• which activities and emission sources are covered;
• the base year used for comparison;
• the target year;
• the planned level of emission reduction;
• how residual emissions will be neutralised; and
• how progress will be measured and independently checked.

How Is Net Zero Calculated?

The basic concept can be expressed as:

For example, suppose an organisation initially emits 100 tonnes of carbon dioxide equivalent each year. It reduces emissions through efficiency, renewable electricity, cleaner transport and changes in its supply chain.

If it reduces its annual emissions to 10 tonnes and then permanently removes and stores 10 tonnes of carbon dioxide, its net emissions would equal zero.

Greenhouse gases are commonly reported as carbon dioxide equivalent, or CO₂e. This metric converts the warming effects of gases such as methane and nitrous oxide into the equivalent amount of carbon dioxide.

Learn more about this measurement in What Is Carbon Equivalent?

Why Is Net Zero Important?

Carbon dioxide accumulates in the atmosphere. The warming associated with carbon dioxide is closely related to the total cumulative quantity emitted over time.

As long as global carbon dioxide emissions remain above zero, the concentration of carbon dioxide generally continues to rise and adds to long-term warming. Reaching global net-zero carbon dioxide emissions is therefore necessary to stop further carbon-dioxide-driven warming from continuing indefinitely.

Other greenhouse gases must also be reduced sharply. Methane, nitrous oxide and fluorinated gases differ from carbon dioxide in their atmospheric lifetimes and warming effects, but they remain important parts of climate mitigation.

Net zero is linked to the goals of the Paris Agreement, which seeks to keep the increase in global average temperature well below 2°C and pursue efforts to limit warming to 1.5°C above pre-industrial levels.

Read more about the goals and objectives of the Paris Agreement.

Net Zero and Related Climate Terms

Several climate terms are frequently used as though they mean the same thing. In practice, their meanings and accounting boundaries may differ.

At the global scale, net-zero carbon dioxide and carbon neutrality may describe equivalent conditions. At the level of a company, product or city, however, the terms can differ because accounting boundaries and the use of external credits may vary.

What Net Zero Does Not Mean

Net zero does not mean:

• continuing present emissions without major reductions;
• planting a few trees while expanding fossil-fuel use;
• excluding large value-chain emissions from the calculation;
• purchasing cheap credits instead of changing operations;
• counting the same carbon reduction more than once;
• waiting until the target year before taking action; or
• claiming that all environmental impacts have been eliminated.

A net-zero pathway should include substantial action in the near term. A distant target without measurable interim reductions has limited credibility.

Scope 1, Scope 2 and Scope 3 Emissions

Companies commonly organise greenhouse gas emissions into three categories under the Greenhouse Gas Protocol.

Scope 1: Direct Emissions

Scope 1 includes direct emissions from sources owned or controlled by an organisation.

Examples include:

• fuel burned in company boilers and furnaces;
• fuel used by company-owned vehicles;
• emissions from industrial processes;
• refrigerant leakage from equipment; and
• on-site power generation.

Scope 2: Purchased Energy Emissions

Scope 2 includes indirect emissions associated with purchased or acquired electricity, steam, heating and cooling used by the organisation.

The emissions physically occur at the power station or energy supplier, but they are attributed to the organisation purchasing and consuming the energy.

Scope 3: Value-Chain Emissions

Scope 3 includes other indirect emissions occurring throughout an organisation’s upstream and downstream value chain.

Examples include:

• purchased materials and services;
• capital goods and equipment;
• transportation and distribution;
• business travel;
• employee commuting;
• waste generated in operations;
• use of sold products;
• end-of-life treatment of products;
• franchises; and
• investments.

For many companies, Scope 3 emissions represent the largest part of the total climate footprint. A net-zero claim that covers only office electricity or company vehicles may therefore exclude most of the organisation’s actual influence.

How Can Net Zero Be Achieved?

There is no single technology that can deliver net zero. It requires coordinated changes in energy, industry, transport, buildings, agriculture, land use, waste management and consumption.

Step 1: Define the Boundary

The organisation or government must identify the activities, gases, facilities, territories and value-chain stages covered by the target.

A narrow boundary can create a misleading claim by excluding major emission sources. The boundary should be complete, transparent and consistent over time.

Step 2: Measure Present Emissions

A greenhouse gas inventory establishes the baseline. Emissions should be calculated using reliable activity data, recognised emission factors and consistent accounting methods.

The inventory should cover major carbon dioxide, methane, nitrous oxide and fluorinated-gas sources where relevant.

Step 3: Set Near-Term and Long-Term Targets

A credible strategy includes both:

• near-term targets that drive immediate emission reductions; and
• long-term targets that reduce emissions to a small residual level before the target year.

Interim targets make it possible to determine whether actual progress is consistent with the final commitment.

Step 4: Avoid Unnecessary Emissions

The first priority is to avoid activities that create emissions without providing necessary social or economic value.

Examples include eliminating energy waste, unnecessary travel, excessive material consumption, avoidable food waste and poorly designed products with short lifespans.

Step 5: Improve Energy and Material Efficiency

Energy-efficient buildings, motors, industrial equipment, cooling systems and appliances can reduce the amount of energy required to provide the same service.

Material efficiency can reduce emissions by using fewer raw materials, extending product life, improving repairability, increasing reuse and designing for recycling.

Step 6: Decarbonise Electricity

Electricity generation must shift from unabated fossil fuels toward low-emission sources such as solar, wind, hydropower, geothermal energy and other appropriate technologies.

Power-system transformation also requires transmission networks, storage, demand management and flexible electricity use.

Step 7: Electrify Suitable Activities

Once electricity becomes cleaner, fossil-fuel uses can be replaced by electricity in suitable applications.

Examples include:

• electric vehicles;
• electric public transport;
• heat pumps for buildings;
• electric industrial heating where technically suitable; and
• electric cooking and equipment.

Step 8: Reduce Methane and Other Non-CO₂ Gases

Methane emissions can be reduced by detecting and repairing oil and gas leaks, ending routine venting and flaring, improving landfill-gas management, reducing food waste and changing agricultural and livestock-management practices.

Nitrous oxide and fluorinated gases also require targeted measures because they arise from different industrial, agricultural and refrigeration sources.

Step 9: Transform Supply Chains

Companies must work with suppliers and customers to address Scope 3 emissions. Procurement standards, product redesign, lower-carbon materials, circular business models and supplier engagement can reduce value-chain impacts.

Step 10: Neutralise Residual Emissions

Only after deep reductions should the remaining difficult-to-eliminate emissions be balanced with high-quality carbon dioxide removal and durable storage.

Residual emissions may remain in sectors such as aviation, shipping, cement production, agriculture and certain industrial processes where complete elimination is technically difficult.

Net-Zero Actions Across Major Sectors

Electricity and Energy

• Expand low-emission electricity generation.
• Modernise grids and energy-storage systems.
• Retire or retrofit high-emission power infrastructure.
• Improve energy efficiency.
• Reduce methane leakage from fossil-fuel operations.

Buildings

• Improve insulation and passive design.
• Use efficient lighting and appliances.
• Replace fossil-fuel heating with efficient electric systems.
• Use low-carbon construction materials.
• Retrofit existing buildings rather than focusing only on new construction.

Transport

• Improve public transport and active mobility.
• Electrify road transport where suitable.
• Improve vehicle efficiency.
• Reduce unnecessary journeys.
• Develop lower-emission fuels for aviation and shipping where direct electrification is difficult.

Industry

• Improve process and energy efficiency.
• Electrify industrial processes where possible.
• Use recycled and lower-carbon materials.
• Develop low-emission steel, cement and chemical production.
• Use carbon capture in selected hard-to-abate processes where appropriate.

Agriculture and Land Use

• Protect forests, wetlands, grasslands and peatlands.
• Prevent deforestation and ecosystem degradation.
• Improve soil and nutrient management.
• Reduce methane and nitrous oxide emissions.
• Reduce food loss and waste.
• Restore degraded ecosystems without replacing natural biodiversity with monoculture plantations.

Waste Management

• Prevent waste generation.
• Increase repair, reuse and recycling.
• Separate organic waste.
• Use composting and anaerobic digestion where appropriate.
• Capture landfill methane.
• Develop circular production systems.

See 15 Strategies to Mitigate Climate Change for a broader overview of emission-reduction measures.

The Role of Carbon Dioxide Removal

Carbon dioxide removal refers to deliberate human activities that remove carbon dioxide from the atmosphere and store it in geological, terrestrial, oceanic or product reservoirs.

Potential removal methods include:

• reforestation and afforestation;
• restoration of peatlands, wetlands and mangroves;
• improved soil-carbon management;
• biochar;
• direct air carbon capture and storage;
• bioenergy with carbon capture and storage; and
• enhanced mineral weathering.

These methods differ substantially in cost, technological readiness, permanence, land requirements, energy use, ecological effects and storage duration.

Natural Carbon Removal

Forests, soils and wetlands absorb and store carbon while supporting biodiversity, water regulation and other ecosystem services.

However, biological carbon storage can be reversed by wildfire, drought, disease, logging, land-use change or poor management. Tree planting should therefore not be treated as a permanent substitute for reducing fossil-fuel emissions.

Learn more about carbon sinks, their types and importance.

Technological Carbon Removal

Direct air carbon capture and storage uses chemical processes to capture carbon dioxide directly from ambient air and store it, usually in geological formations.

This differs from conventional carbon capture and storage at a power station or industrial plant. Point-source carbon capture prevents some new carbon dioxide from reaching the atmosphere, but it does not by itself remove carbon dioxide that is already present in the air.

Read more in Carbon Capture: What Is It All About?

Are Carbon Offsets Enough to Reach Net Zero?

No. Carbon offsets cannot replace deep emission reductions.

A carbon credit commonly represents one tonne of carbon dioxide equivalent that has been avoided, reduced or removed through a project.

Examples may include:

• renewable-energy projects;
• forest protection;
• reforestation;
• methane capture;
• improved cookstoves; or
• technological carbon removal.

However, avoided emissions and carbon removals are not the same.

• Avoided-emission credit: claims that emissions were lower than they would otherwise have been.
• Removal credit: represents carbon dioxide taken out of the atmosphere and stored.

At the point of reaching net zero, residual emissions must be balanced by genuine removals rather than only by claims that emissions were avoided somewhere else.

Quality Problems with Carbon Credits

Carbon-credit quality depends on several factors:

• Additionality: Would the reduction or removal have occurred without credit revenue?
• Permanence: How long will the carbon remain stored?
• Leakage: Does the project shift emissions or deforestation to another location?
• Measurement: Can the claimed reduction or removal be quantified accurately?
• Double counting: Is the same climate benefit claimed by more than one entity?
• Verification: Has the project been independently assessed?
• Social safeguards: Does the project respect communities and land rights?
• Ecological integrity: Does it protect biodiversity and avoid environmental harm?

What Makes a Net-Zero Target Credible?

A credible net-zero target should include the following elements:

1. A Clearly Defined Boundary

The claim should state which gases, operations, facilities, countries, products and value-chain emissions are covered.

2. A Complete Emissions Inventory

The organisation should measure its major Scope 1, Scope 2 and Scope 3 emissions using recognised accounting methods.

3. A Recent and Representative Base Year

The baseline should reflect normal operations rather than an unusually high-emission year selected to make reductions appear larger.

4. Near-Term Reduction Targets

The organisation should show what it will achieve during the next several years, not only make a distant promise for 2050 or another target year.

5. Deep Absolute Emission Reductions

Absolute emissions should decline substantially. Reducing emissions per unit of product is useful, but total emissions may still rise if production increases rapidly.

6. Coverage of the Value Chain

A company should not ignore suppliers, transportation, product use, investments or end-of-life impacts when these represent major emission sources.

7. Limited Reliance on Removals

Carbon removal should be reserved mainly for residual emissions that remain after practical reduction measures have been implemented.

8. A Published Transition Plan

The organisation should explain the technologies, investments, operational changes and policies through which targets will be achieved.

9. Regular Public Reporting

Progress should be disclosed at consistent intervals using comparable data.

10. Independent Verification

External assurance can improve confidence in emission inventories, target coverage and progress claims.

11. Alignment with Capital Expenditure

Investment decisions should support the target. A company cannot credibly claim a net-zero pathway while continuing to expand long-lived high-emission infrastructure without a clear transition plan.

12. A Just and Environmentally Responsible Transition

Net-zero strategies should consider workers, affected communities, affordability, energy access, biodiversity, land rights and wider environmental impacts.

How to Identify Net-Zero Greenwashing

Warning signs include:

• a distant target with no interim milestones;
• no complete greenhouse gas inventory;
• exclusion of major Scope 3 emissions;
• continued growth in absolute emissions;
• heavy reliance on low-quality carbon credits;
• no explanation of how residual emissions were calculated;
• claims based only on renewable-energy certificates or tree planting;
• selective reporting of successful projects;
• no independent verification;
• use of vague terms such as green, eco-friendly or climate positive without evidence; and
• business investments that conflict with the stated transition plan.

A credible claim should allow readers to distinguish actual emission reductions from avoided emissions, purchased credits and carbon removals.

Net Zero for Countries and Companies

Countries

For a country, net zero generally refers to the balance between greenhouse gases emitted within its accounting boundary and greenhouse gases removed by managed sinks and removal activities.

National pathways differ because countries vary in historical emissions, development needs, energy systems, natural resources, financial capacity and vulnerability to climate change.

National net-zero strategies commonly include:

• cleaner electricity;
• energy efficiency;
• public transport and electrification;
• lower-emission industry;
• methane reduction;
• forest and ecosystem protection;
• climate finance;
• research and innovation; and
• support for affected workers and communities.

Companies

For a company, net zero should cover emissions from operations, purchased energy and material value-chain sources.

A credible corporate pathway may include:

• setting science-based targets;
• using renewable or low-emission electricity;
• improving operational efficiency;
• redesigning products;
• reducing material use;
• working with suppliers;
• reducing transport emissions;
• extending product life;
• supporting repair, reuse and recycling;
• changing investment and procurement criteria; and
• neutralising residual emissions at the target year.

Corporate climate claims are especially important because a relatively small group of major fossil-fuel and industrial producers has contributed a substantial share of historical industrial emissions. Read more about the Carbon Majors Report and corporate climate responsibility.

Can Individuals Become Net Zero?

Individuals can reduce their personal carbon footprints, but personal action alone cannot create a net-zero economy. Energy grids, transport systems, building standards, industries and public policies strongly influence the options available to individuals.

Useful personal actions include:

• using public transport, cycling or walking where practical;
• reducing unnecessary vehicle and air travel;
• improving household energy efficiency;
• selecting cleaner electricity where available;
• reducing food waste;
• consuming fewer short-lived products;
• repairing and reusing goods;
• choosing lower-impact diets where appropriate;
• supporting credible climate policies; and
• holding businesses and public institutions accountable.

Personal carbon-offset purchases may support useful projects, but they should not be described as eliminating the wider environmental effects of a person’s consumption.

Challenges and Limitations of Net Zero

1. Difficult-to-Eliminate Emissions

Some emissions from agriculture, aviation, shipping, cement, steel and chemical production are technically difficult or expensive to eliminate completely.

2. Uncertain Future Removals

Some pathways depend heavily on carbon-removal technologies that are currently expensive, energy-intensive or not deployed at the required scale.

3. Limited Land

Large-scale tree planting or bioenergy may compete with food production, biodiversity conservation and community land rights.

4. Reversal of Biological Storage

Carbon stored in forests and soils can return to the atmosphere through fire, drought, pests, harvesting or land-use change.

5. Inconsistent Accounting

Different organisations may use different boundaries, gases, time periods, emission factors and crediting rules.

6. Equity and Climate Justice

Countries have contributed unequally to historical emissions and differ greatly in financial resources and development needs. A fair transition must recognise these differences.

7. Greenwashing

Net-zero language can be used to create an environmentally responsible image without corresponding operational change.

8. Delayed Action

Relying on future technology or removals can postpone reductions that are possible today. Delayed reduction increases cumulative emissions and makes later targets harder to achieve.

Frequently Asked Questions

What does net zero mean in simple terms?

Net zero means reducing greenhouse gas emissions to a very low level and balancing the remaining emissions with an equivalent amount removed from the atmosphere.

Does net zero mean no emissions?

No. Net zero allows a small amount of residual emissions, provided they are balanced by genuine greenhouse gas removals. Zero emissions means that no relevant emissions are produced.

Is net zero the same as carbon neutral?

The terms overlap, especially at the global scale, but they are not always used in the same way. Carbon-neutral claims may cover a narrower boundary or rely more heavily on purchased offsets. A credible net-zero target normally requires deep reductions before residual emissions are neutralised.

What is the difference between net-zero CO₂ and net-zero greenhouse gas emissions?

Net-zero CO₂ covers carbon dioxide emissions and removals. Net-zero greenhouse gas emissions includes other gases such as methane, nitrous oxide and fluorinated gases, expressed using an agreed climate metric.

Why must emissions be reduced before using removals?

Removal capacity is limited and can involve high costs, land requirements, energy use and storage risks. Reducing emissions directly decreases the quantity that must later be removed.

Can tree planting achieve net zero?

Tree planting can contribute to carbon removal, but it cannot replace deep fossil-fuel and industrial emission reductions. Forest carbon may also be reversed by wildfire, drought, disease or deforestation.

Is carbon capture the same as carbon removal?

No. Capturing carbon dioxide from an industrial facility prevents some new emissions from entering the atmosphere. Carbon removal takes carbon dioxide that is already in the atmosphere and stores it.

What are residual emissions?

Residual emissions are emissions that remain after feasible reduction measures have been implemented. They may arise from technically difficult processes in sectors such as agriculture, aviation, shipping, cement and heavy industry.

Can carbon offsets make a company net zero?

Offsets alone do not make a company credibly net zero. The company must first reduce emissions deeply across its operations and value chain. Remaining emissions should be neutralised using high-quality removals.

Why are Scope 3 emissions important?

Scope 3 includes emissions from suppliers, transportation, product use, waste, investments and other value-chain activities. These emissions may be much larger than a company’s direct operational emissions.

What happens after net zero is achieved?

Emissions must remain at or below the net-zero level. Organisations may also pursue net-negative emissions by removing more greenhouse gases than they emit.

Key Takeaways

• Net zero means balancing residual human-caused emissions with human-caused removals.
• Deep emissions reduction must come before carbon removal.
• Net zero does not mean continuing present emissions and purchasing offsets.
• Net-zero CO₂ and net-zero greenhouse gas emissions are not identical.
• Carbon neutrality may be used more broadly than a science-based net-zero target.
• Companies should address Scope 1, Scope 2 and material Scope 3 emissions.
• Carbon capture at an industrial source is not automatically carbon dioxide removal.
• Carbon removals differ in permanence, cost, scale and environmental effects.
• Credible targets require interim milestones, transparent reporting and verification.
• Net zero requires systemic changes across energy, transport, industry, buildings, agriculture and land use.

Conclusion

So, what does net zero mean? It means reducing greenhouse gas emissions to the lowest practical level and balancing only the remaining residual emissions with equivalent, verifiable removals from the atmosphere.

The concept is not permission to continue high emissions indefinitely. Its scientific value depends on rapid and sustained reductions, complete accounting, limited reliance on removals and transparent reporting.

Governments, businesses and institutions must transform energy systems, transport, buildings, industrial production, agriculture, land use and waste management. Carbon removal can support this transition, but it cannot substitute for reducing fossil-fuel use and other avoidable emissions.

A credible net-zero target is therefore not simply a promise about a distant year. It is a measurable pathway showing what will be reduced now, what will be transformed over time and how the small amount of genuinely residual emissions will ultimately be neutralised.

Further Reading

• 15 Simple Strategies to Mitigate Climate Change
• How Do Greenhouse Gases Contribute to Global Warming?
• Understanding the Goals and Objectives of the Paris Agreement
• Carbon Capture: What Is It All About?
• Understanding Carbon Sinks: Types and Importance
• What Is Carbon Equivalent?
• 23 Examples of Renewable and Non-Renewable Resources

References

• Intergovernmental Panel on Climate Change: Glossary of Net-Zero and Climate Terms
• Intergovernmental Panel on Climate Change: Carbon Dioxide Removal Factsheet
• United Nations: Net Zero Coalition
• United Nations: Integrity Matters for Net-Zero Commitments
• Greenhouse Gas Protocol: Corporate Standard
• Greenhouse Gas Protocol: Scope 3 Standard
• International Energy Agency: Net Zero Emissions by 2050 Scenario
• Science Based Targets Initiative: Corporate Net-Zero Standard
• United Nations Framework Convention on Climate Change: The Paris Agreement