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Sustainability & ESG Terms Explained: A Plain-Language Glossary

Sustainability and ESG terms show up everywhere now but rarely get explained. Here is what the most common ones actually mean.

ESG (Environmental, Social, Governance)

A framework investors and companies use to evaluate a business beyond its financial statements — covering its environmental impact, how it treats workers and communities, and how transparently and ethically it is run. ESG scores from different rating agencies can vary a lot because there is no single universal standard for calculating them.

Carbon neutral vs. net zero

Carbon neutral usually means a company’s emissions are balanced out by purchasing offsets elsewhere, while net zero generally implies a stronger commitment to actually cutting most emissions first and offsetting only what is left. The two terms are often used loosely and inconsistently, so it is worth checking what a specific claim is actually backed by.

RE100

A global corporate initiative in which member companies commit to sourcing 100% of their electricity from renewable sources by a target year. It is a voluntary pledge, not a government regulation, and companies join it publicly as a signal to investors and customers.

Circular economy

An economic model built around reusing, repairing, and recycling materials for as long as possible, instead of the traditional “take, make, dispose” linear model. The goal is to keep resources in use and minimize waste sent to landfills.

Greenwashing

When a company exaggerates or fabricates the environmental benefits of its products or practices to appear more sustainable than it actually is, often through vague language like “eco-friendly” without any specifics or independent verification behind it.

Carbon credits and offsets

A carbon credit represents one metric ton of CO2 (or equivalent) either avoided or removed from the atmosphere, often through projects like reforestation or renewable energy. Companies buy offsets to counterbalance emissions they have not yet eliminated, though the actual environmental impact of individual offset projects varies widely and is sometimes disputed.

Why these terms suddenly seem to be everywhere

Regulators, investors, and consumers have all started paying closer attention to corporate environmental and social impact over the past decade, which pushed companies to publicize their sustainability commitments as part of branding and investor relations. That surge in usage is also part of why the terms are inconsistently defined — they entered mainstream vocabulary faster than standardized definitions could keep up.

How to read a sustainability claim critically

A specific, measurable claim (“we cut Scope 1 emissions by 12% in 2025, verified by a third party”) is generally more trustworthy than a vague one (“we care about the planet”). Look for third-party verification, concrete numbers, and a clear timeline rather than taking a company’s self-description at face value.

Frequently Asked Questions

Is “carbon neutral” the same as “zero emissions”?

No. Carbon neutral typically means emissions are balanced out through offsets purchased elsewhere, not that the emissions never happened. A company can be carbon neutral on paper while still emitting significant amounts of CO2 directly.

Are these terms legally regulated?

It depends heavily on the country and term. Some jurisdictions have started introducing rules against misleading environmental marketing claims, but many sustainability terms, including “eco-friendly” and “green,” still have no universally enforced legal definition, which is part of why greenwashing is hard to police.