Climate Solution or Greenwashing Experiment
Carbon Credits:
Climate Solution or the
World's Biggest Greenwashing Experiment?
A global carbon market worth over a trillion dollars promises to reconcile economic growth with planetary survival. But is it actually cooling the planet — or cooling corporate reputations?
In the summer of 2021, a major European airline announced it had achieved "carbon neutrality" on thousands of flights by purchasing carbon offsets from a rainforest conservation project in the Amazon. Passengers were encouraged to feel good about their footprints. Journalists, in due course, were not. The project in question, it later emerged, had been certifying emissions reductions for forests that were barely threatened to begin with. The credits were, in the dry vocabulary of environmental science, "non-additional" — meaning the forest would have been fine without the money.
This is not an isolated anecdote. It is, increasingly, a pattern. The voluntary carbon market — the mechanism by which corporations, individuals, and even governments pay for certified emissions reductions elsewhere in the world — has become one of the most contested instruments in contemporary climate policy. Supporters see it as an indispensable bridge to net-zero. Critics see it as an elaborate system for buying permission to continue polluting. Both sides marshal data, and the data is genuinely ambiguous.
This article does not promise to resolve that ambiguity. It does promise to examine it rigorously — the science, the economics, the politics, and the uncomfortable moral philosophy underneath the spreadsheets.
Origins: From Kyoto to Paris
The intellectual ancestry of carbon trading traces to a distinctly American tradition: the sulphur dioxide cap-and-trade system introduced under the 1990 Clean Air Act Amendments. The mechanism worked. By creating a market for pollution allowances, it reduced SO₂ emissions from power plants at a fraction of the cost economists had projected. The lesson seemed transferable to carbon dioxide.
The 1997 Kyoto Protocol formalised carbon trading in international climate law. Under its "flexible mechanisms" — the Clean Development Mechanism (CDM), Joint Implementation, and Emissions Trading — industrialised nations could meet their emissions targets partly by financing reductions in developing countries or trading credits with each other. The logic was explicitly economic: if it is cheaper to reduce a tonne of CO₂ in rural India than in a German steel mill, global welfare is maximised by directing abatement where the marginal cost is lowest.
Kyoto's carbon market was, by most assessments, a troubled experiment. The CDM issued over 2.1 billion credits between 2001 and 2020, but post-hoc analysis found that a significant proportion — particularly in renewable energy projects in China and India — lacked additionality. The projects would have happened regardless of CDM revenue. One oft-cited academic estimate put the share of genuinely additional CDM credits at around 2 percent.
The 2015 Paris Agreement restructured the international framework but did not abandon market mechanisms. Article 6 of the Agreement created provisions for carbon market cooperation between countries. Its implementation rules, however, required six years of fraught negotiation before agreement was reached at COP26 in Glasgow in 2021 — testimony to how politically sensitive the accounting of carbon credits remains.
"If a forest credit represents a tree that was never going to be cut down, it is not an offset. It is a permission slip."
— Commonly cited in environmental economics literature on additionalityThe Mechanics of Carbon Markets
Two parallel systems operate today, and conflating them is one of the most persistent errors in public discourse about carbon credits.
Compliance markets — the larger, more heavily regulated system — operate under law. The European Union Emissions Trading System (EU ETS), the world's largest by value, covers around 37 percent of the EU's total greenhouse gas emissions. Regulated installations receive or buy allowances, each representing the right to emit one tonne of CO₂ equivalent. The cap on total allowances declines annually, creating structural scarcity and a rising price signal. In 2024, the EU ETS traded over €1 trillion in volume. Regulated entities that emit less than their allowances can sell the surplus; those that emit more must buy. This is the cap-and-trade mechanism in its intended form.
Voluntary carbon markets (VCMs) — the smaller, largely unregulated system — are where most of the controversy lives. Here, companies purchase carbon credits certified by private standards bodies (most prominently Verra and Gold Standard) to offset emissions they cannot yet eliminate. Credits come from projects that supposedly reduce or avoid emissions: forest conservation under REDD+ (Reducing Emissions from Deforestation and Forest Degradation), renewable energy installations, improved cookstove distribution, methane capture, and others. The voluntary market traded roughly €1.5 billion in 2024 — tiny relative to the compliance market, but enormous in reputational significance, since it is the mechanism behind most corporate "carbon neutrality" and "net-zero" claims.
Compliance allowances under the EU ETS traded at approximately €60–70 per tonne of CO₂ in 2024, reflecting genuine scarcity created by a declining cap.
Voluntary credits — particularly REDD+ forest credits — traded at roughly $2–3 per tonne in 2023–2024, down from around $9 at the 2021 peak, following the wave of credibility scandals. A credit that repres
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