Water vapor is the most significant greenhouse gas in terms of average atmospheric concentration (2 to 3%),but its amount varies quickly over a matter of days,whereas the average level of carbon dioxide changes much more slowly.

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This statement is true. Water vapor levels in the atmosphere can vary quickly due to changes in temperature and local weather patterns, while carbon dioxide levels have a much slower rate of change. However, despite its variability, water vapor is still the most significant greenhouse gas due to its high concentration.

Water Vapor Is the Most Significant Greenhouse Gas in Terms