Carbon Questions Answered

The same questions come up whenever people start looking at carbon seriously. Some are about definitions, some about cost, and some about whether any of it makes a difference. This page gives short answers to the most common ones, with links to the fuller guides for anyone who wants the detail.

What is the difference between an offset and a credit?

An offset is the act of paying for a reduction elsewhere to balance emissions you cannot remove. A credit is the unit that reduction is packaged into, usually one metric tonne of CO2 equivalent. When you buy an offset, a credit is retired in a registry on your behalf. The two are used interchangeably in conversation, but keeping them apart makes the rest of the subject clearer. The offsets section explains the distinction in full.

Does offsetting actually work?

Offsetting works when the project is real, the reduction is additional and the credit is retired and traceable. It does not work when it is used as a substitute for reducing emissions, or when the credit sits in an account rather than being retired. The accepted order is to measure, reduce and then offset the remainder, stating how large that remainder is. The mechanics guide walks through what happens after a purchase.

Is it better to reduce or to offset?

Reduce first, always. A tonne not emitted is a tonne that needs no project, no verification and no registry, and it usually saves money along the way. Offsetting is for the remainder that cannot yet be removed. A plan that offsets without reducing is a transaction rather than a strategy, and it will not survive scrutiny. The cutting emissions section ranks the reductions that matter most.

How much does it cost to be carbon neutral?

There is no single price, because it depends on the size of the footprint and on the projects chosen. What can be said is that the cost of offsets is usually a small fraction of the cost of the reductions that come first, and that a large footprint is expensive to offset year after year. This is one reason to reduce before buying. A household offsetting a few tonnes and a business offsetting thousands are operating at very different scales, and the business guide shows how the total is built.

What does carbon neutral actually mean?

In common use it means a measured footprint has been balanced by buying an equivalent quantity of offsets. It says nothing on its own about whether emissions were reduced first, which is why a claim should always state the boundary and the reductions behind it. Net zero is a stronger claim, usually requiring real reductions plus removals for what remains. The carbon labels guide takes the wording apart.

How do I know an offset is genuine?

Check four things. Which standard issued the credit, and is it a recognised one. Whether the project can explain its additionality, meaning the reduction would not have happened without the money. Whether the credits are verified by an independent auditor. And whether they are retired in a public registry with a serial number you can look up. If all four hold, the offset is as genuine as the system allows. The verification guide shows how to do the check.

What is double counting?

Double counting happens when the same reduction is claimed twice. The simplest form is selling one credit to two buyers, which a registry prevents because a retired credit cannot be sold again. The harder form is when both the host country and the buyer claim the same reduction, which is addressed by corresponding adjustment rules that cancel the reduction from the host's ledger. The verification guide covers both cases.

Where should I start?

Start by measuring. A footprint tells you which sources dominate, and that is what makes a plan possible. For a household, the calculator gives a first estimate and the household guide explains each input. For a business, the business guide sets out the scopes. Once the number exists, the cutting emissions section ranks the changes, and the offsets section explains what to do with what remains.

Are carbon offsets regulated?

Not in a single global way. Some jurisdictions have introduced rules for specific claims, and some consumer protection laws already treat a misleading environmental claim as a problem, but there is no worldwide regulator of offsets. What exists instead is a set of private standards that define how projects are run and credits are issued, and a set of registries that record them. Those standards are not law, but they are the closest thing to a quality mark in the market, which is why naming the standard behind a credit is the first question to ask. The verification guide explains how to check a specific claim.

How long does a footprint take to build?

For a household, an afternoon with a year of bills is enough to produce a useful estimate. For a business, a first inventory usually takes a few days of data collection spread over a few weeks, because the information sits with different people and some of it has to be requested from suppliers. Later years are faster, because the method and the sources are already recorded. The business footprint guide sets out what to collect first.

The temptation to wait for perfect data is worth resisting. A rough inventory that names its gaps is more useful than a precise one that never gets finished, and it can be improved year by year. What matters is that the boundary is stated and the method is consistent, so that the following year can be compared honestly.

Do small changes make any difference?

Some do, some barely. The pattern across households and organisations is that a few large sources dominate the total, so a change to heating, driving or flying moves the number far more than a long list of small gestures. That does not make small changes pointless, but it does mean they should come after the big ones rather than instead of them. Measuring first is what reveals which is which. The measuring section explains how to build that first estimate.