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Which greenhouse gases have the largest influence on Earth’s energy budget?
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Greenhouse gas
Map of annual carbon dioxide emissions by country in 2014.
The greenhouse gases with the most significant influence on Earth’s energy budget are water vapor, carbon dioxide, and methane.1
- Water vapor: This is the most potent greenhouse gas in the atmosphere. Its concentration is primarily determined by air temperature rather than direct human activity; as the surface warms, evaporation increases, leading to higher concentrations of water vapor that trap more infrared radiation.2
- Carbon dioxide (CO₂): This is the most prominent greenhouse gas. While natural processes act as "sinks" to remove CO₂ from the atmosphere, human activities—such as fossil-fuel combustion and deforestation—have increased its concentration significantly, making it a primary driver of climate change.2
- Methane (CH₄): Although it exists in lower concentrations than CO₂, methane is a highly potent greenhouse gas. Human activities, including livestock farming and the use of fossil fuels, have caused its atmospheric concentration to more than double since preindustrial times.2
Other gases, such as surface-level ozone, nitrous oxides, and various fluorinated gases, also contribute to the greenhouse effect, though to a lesser extent.21