Frequently Asked Questions

Does EIA report water vapor emissions data?

No. Water vapor is the most abundant greenhouse gas, but most scientists believe that human activity has a very small direct effect on its concentration in the atmosphere. Thus, EIA does not estimate emissions of water vapor.

Research by NASA suggests a stronger role from the indirect human effects on water vapor concentrations.

Learn more:

What are greenhouse gases and how much are emitted by the United States?

Last updated: August 1, 2013

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