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Social Cost of Carbon: Putting a Price on Climate Damage

Every extra tonne of carbon dioxide has a price tag, even if nobody pays it directly. Economists call it the Social Cost of Carbon.

The 2023 Fargo flood. Property damage from events like this is exactly the kind of cost the Social Cost of Carbon tries to put a number on. Photo by Max DeVos, via Wikimedia Commons. Licensed CC BY-SA 4.0.

📑 Contents

1Must Know
2Good to Know
3Test Yourself
4Great to Know
5Previous Year Questions

Pricing an Invisible Damage

EnvEco0105

Per Tonne

SCC is measured per tonne of CO2 emitted in a given year

Monetary

Expressed in dollars, not tonnes or temperature degrees

Long-Term

Captures damage extending decades beyond the emission year

Policy Tool

Used to justify or size climate regulations and carbon prices

The pattern: the Social Cost of Carbon turns an abstract, distant harm into a concrete number policymakers can actually weigh against a project’s benefits.

🏛️ Must Know

What the Social Cost of Carbon Measures

The Definition The Social Cost of Carbon is a monetary measure. It values the long-term damage done by one tonne of CO2 emissions in a given year.
Not a Fuel Requirement It is not a measure of fossil fuel requirements for a country’s goods and services. That’s a different, unrelated concept entirely.
Not About Refugees It also isn’t a measure of a climate refugee’s adaptation efforts, or an individual’s personal carbon footprint.
What It Includes It captures damages like reduced agricultural output, health impacts, flood risk, and energy system costs. All of these get converted into a dollar figure.

Good to Know

📘 Good to Know

Why This Number Is So Contested

Wildly Varying Estimates Estimates of the Social Cost of Carbon vary hugely. Older US estimates put it around $21 per tonne; newer research puts it over $180 per tonne.
The Discount Rate Problem Much of that gap comes down to the discount rate used. It’s essentially how much less future damage is weighted against damage happening today.
Real Policy Stakes Governments use this number to size climate regulations and carbon taxes. A higher or lower estimate directly shapes real policy decisions.

📝 Previous Year Questions

UPSC CSP 2020 — What “Social Cost of Carbon” Means

UPSC 2020 The Social Cost of Carbon is the long-term monetary damage done by a tonne of CO2 emissions in a given year. It is not a fossil-fuel-requirement or individual-footprint measure. See UPSC CSP 2020 GS Paper I, Q85. View this question.

Test Yourself

Great to Know

🌟 Great to Know

How Governments Actually Use This Number

Cost-Benefit Analysis Regulators use the Social Cost of Carbon in cost-benefit analysis. It weighs a regulation’s compliance cost against the emissions damage it prevents.
A Building Block for Carbon Pricing It also underpins carbon tax and carbon-pricing debates. It offers a reasoned starting point for what a tonne of CO2 should actually cost.
Not a Fixed, Settled Number Estimates keep being revised upward as climate science improves. The figure is a moving target, not a permanently fixed constant.

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