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What are the main gases that contribute to global warming?

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A layer of greenhouse gases – primarily water vapor, and including much smaller amounts of carbon dioxide, methane and nitrous oxide – acts as a thermal ... read more

The main gas (including vapors) that contributes to global warmth is water vapor. The main gas that contributes to global warming is CO2 (the other gases currently contributing to long-term warming are around 20% of CO2’s contributors). Without water vapor the surface would be some 30 C cooler. read more

Two characteristics of atmospheric gases determine the strength of their greenhouse effect. The first is the Global Warming Potential (GWP), a measure of the radiative effect of each unit of gas over a specified period of time, expressed relative to the radiative effect of carbon dioxide (CO 2). read more

For each greenhouse gas, a Global Warming Potential (GWP) has been calculated to reflect how long it remains in the atmosphere, on average, and how strongly it absorbs energy. Gases with a higher GWP absorb more energy, per pound, than gases with a lower GWP, and thus contribute more to warming Earth. read more

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