The simplest way to reduce something is to make it cost more. That’s the logic behind carbon pricing: put a direct price on greenhouse gas emissions, and the economic incentive to cut them follows.
It sounds straightforward. In practice, carbon pricing is one of the most debated tools in climate policy, with several different models in use across the world, significant variation in how effective each one has been, and an ongoing argument about how high the price needs to go to actually change behavior at scale.
Here’s what you need to know.
The two main models: carbon taxes and cap-and-trade
Carbon pricing takes two main forms, and the distinction matters.
A carbon tax sets a fixed price per tonne of emissions. Governments charge emitters directly, and the revenue can be returned to citizens, invested in clean energy, or used to reduce other taxes. The price is predictable, which makes it easier for businesses to plan. What it doesn’t guarantee is the total quantity of emissions reduced: if companies decide the tax is cheaper than changing their operations, they pay it and emit anyway.
A cap-and-trade system (also called an emissions trading system, or ETS) works differently. A government sets a cap on total emissions in a given sector or region, issues permits up to that cap, and lets companies trade permits among themselves. Companies that reduce emissions faster than required can sell spare permits to companies that can’t. The total emissions are fixed by the cap; the price that emerges from trading reflects what reductions actually cost in that market.
The European Union ETS is the largest cap-and-trade system in the world, covering roughly 40 percent of EU emissions across power generation, heavy industry, and aviation. California operates its own cap-and-trade program. More than 70 carbon pricing systems are now in operation globally, covering about 23 percent of global greenhouse gas emissions.
Compliance markets vs voluntary markets
Government carbon pricing systems are called compliance markets because companies are legally required to participate. The rules, the caps, and the penalties are set by regulators.
The voluntary carbon market operates differently. In the voluntary market, companies and individuals choose to purchase carbon credits to offset emissions that they haven’t been required to reduce. Credits represent verified emission reductions from specific projects: a tree-planting program in East Africa, a cookstove project in Honduras, a peatland restoration initiative. Buyers purchase the credits because they want to act on climate, not because a regulator requires it.
Cool Effect operates in the voluntary carbon market. The credits on our platform represent real, independently verified emission reductions from projects around the world. 90 percent of every dollar donated goes directly to the project, with a 9.87 percent administrative fee and nothing hidden.
Does carbon pricing actually work?
The evidence is mixed and context-dependent.
Studies of the EU ETS have found meaningful emission reductions in covered sectors, particularly when permit prices have been high enough to make clean alternatives cost-competitive. British Columbia’s carbon tax has been associated with reduced fuel consumption without measurable economic harm to the province. Sweden has had a carbon tax since 1991 and has reduced its emissions significantly while maintaining economic growth.
But low carbon prices can be ineffective. A price of $5 per tonne doesn’t move many investment decisions in industries where carbon is cheap to emit. Most economists studying climate policy argue that carbon prices in major economies need to be substantially higher than current levels to drive the kind of structural change the climate requires.
Carbon pricing also doesn’t operate in isolation. The most effective climate policies pair pricing with regulations, technology standards, and direct investment in alternatives. Pricing alone is a tool, not a complete strategy.
Where this leaves individuals and businesses
For individuals, carbon pricing in compliance markets mostly shows up indirectly: in the cost of gasoline, electricity, and goods from industries covered by the system. For businesses operating under a compliance scheme, the price of carbon is a real input into operational decisions. If you’re looking to go further, our guide to making a real business climate commitment covers what that looks like in practice.
For those who want to go further than what compliance requires, the voluntary market offers a way to directly fund verified emission reductions now, in the places and project types that matter most. You can also offset the carbon footprint of your travel in minutes.
That’s what Carbon Done Correctly looks like in practice: not waiting for a price signal to make the math work, but funding real reductions because the climate requires them.
If you want to understand what separates a high-quality carbon credit from a low-quality one, our guide to what makes a high-quality carbon offset walks through exactly that.