Net zero means cutting greenhouse gas emissions as close to zero as possible, and neutralizing what remains. The balance is the whole concept: emissions still going into the atmosphere are matched by emissions removed from it, so the net addition is zero. It is the state the IPCC’s pathways require for the global economy — net-zero CO2 around mid-century for the 1.5°C limit — translated into a target that governments and companies have adopted by the thousand. It is also a phrase stretched over very different levels of seriousness. This page is the definition, the distinctions that keep it honest, and the tests that separate a net zero plan from a net zero slogan.
The definition, precisely
Net zero is a balance across all greenhouse gases, achieved primarily by reduction. The gases are counted in CO2-equivalent across the emitter’s full footprint — Scope 1, 2, and 3, the framework this site teaches in its carbon accounting guide. The sequence is not optional in any credible version: deep reductions first — the Science Based Targets initiative’s Corporate Net-Zero Standard, the most widely used corporate benchmark, expects reductions on the order of 90 percent against the baseline — and only the residual, genuinely hard-to-abate remainder is neutralized with removals. A “net zero” claim that begins with buying instruments against an unchanged footprint is not an early version of this. It is a different thing wearing the name.
Net zero versus carbon neutral: the distinction that matters
Carbon neutral is the older, weaker claim. It typically covers CO2 only (not all greenhouse gases), often covers only part of the footprint, and historically allowed the balance to be struck with avoidance credits — paying for emissions not to happen elsewhere — with no requirement that the claimant’s own emissions fall. Net zero, in its standardized forms, is broader in gases, fuller in scope, and insists on the claimant’s own deep reductions plus durable removals for the residual. In practice the labels on real claims vary wildly, so the working rule is to ignore the banner and read the boundary: which gases, which scopes, what reduction before any neutralization, and what kind of removal. Four answers that turn a slogan into an auditable claim — or reveal that it is not one.
Removals: what may balance the residual
Only removals count, and durability is the argument. Neutralization means taking CO2 out of the atmosphere and storing it — reforestation and ecosystem restoration at the biological end, direct air capture with geological storage at the engineered end. The debate inside net zero is about permanence and timing: a tonne stored in a forest that burns in thirty years does not balance a tonne emitted today in the way a tonne in basalt might, and credible standards are tightening around that difference. This is also where carbon credits — treated in depth in this site’s guide to carbon credits and the GHG Protocol — must be read carefully: credits representing avoided emissions are a finance contribution to someone else’s reduction; they are not removals of your own.
Why companies adopt it — including the hard reason
The public reasons are climate alignment and stakeholder expectation; the hard reason is transition risk. A company whose footprint stays high is short a position against carbon pricing, disclosure law, customer procurement rules, and the physical exposure of its own assets — the complex this site examines in transition risk and stranded assets. A net zero target with a real reduction pathway is the management answer to that position: it converts an unbounded future liability into a sequenced capital plan. That is also the honest way to judge any company’s target from outside — not by the date in the headline, but by whether the interim milestones, the capital allocation, and the scope boundary look like a plan an operator could actually execute.
The five tests of a credible net zero claim
Boundary: all three scopes, or an explained and immaterial exclusion. Baseline: a stated year with a published footprint, so progress can be checked. Sequence: reduction commitments on the order of 90 percent before neutralization, with dated interim targets — a 2050 promise with no 2030 number is a wish. Removals: neutralization reserved for the residual, with durability addressed rather than assumed. Disclosure: progress reported on the same boundary as the pledge, including the years it went backwards. A claim that passes all five is rare and worth crediting. A claim that fails the first is not yet a claim at all.
Frequently asked questions
What does net zero mean?
A balance: greenhouse gas emissions cut as close to zero as possible, with the small residual neutralized by removals from the atmosphere, so the net addition is zero. Credible versions require deep reductions first — around 90 percent in the Science Based Targets initiative’s corporate standard — before any neutralization.
What is the difference between net zero and carbon neutral?
Carbon neutral is older and weaker: usually CO2 only, often a partial footprint, and historically balanceable with avoidance credits without reducing the claimant’s own emissions. Net zero spans all greenhouse gases and the full footprint, requires deep own-reductions, and reserves durable removals for the residual.
By when must the world reach net zero?
IPCC pathways limiting warming to 1.5°C reach net-zero CO2 around 2050, with net-zero greenhouse gases later in the century. Company and country targets cluster around 2050 for that reason — the date comes from the carbon budget, not from fashion.
Can a company reach net zero by buying carbon credits?
Not credibly, if the credits substitute for reducing its own emissions. Credits that finance reductions elsewhere are a contribution, not neutralization. The standardized sequence is: measure the full footprint, reduce it by roughly 90 percent, and neutralize only the residual — with removals, whose durability has to be addressed.