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The carbon ratio, also known as the carbon ratio or carbon dioxide equivalent (CO2e), is a measure used to compare the global warming potential of different greenhouse gases. It is expressed as the amount of carbon dioxide (CO2) that would have the same global warming impact as a given amount of another greenhouse gas over a specified time period, typically 100 years. This ratio is crucial for understanding the environmental impact of various gases and for developing effective strategies to reduce greenhouse gas emissions.

The carbon ratio is calculated by comparing the radiative forcing of a greenhouse gas to that of CO2. Radiative forcing is a measure of the change in the Earth's energy balance caused by a particular factor, such as a greenhouse gas. The carbon ratio is then determined by the ratio of the radiative forcing of the gas in question to that of CO2, multiplied by the molecular weight of CO2 divided by the molecular weight of the gas in question. This calculation ensures that the comparison is made on a per-carbon basis, allowing for a more accurate assessment of the global warming potential of different gases.

The carbon ratio is widely used in climate science and policy to assess the environmental impact of various activities and to set targets for reducing greenhouse gas emissions. By understanding the carbon ratio, policymakers and individuals can make informed decisions about how to mitigate climate change and transition to a more sustainable future.