What percentage of wetlands has been lost?

The correct response is based on information that indicates approximately 40% of wetlands have been lost across various regions, particularly in places like the United States. This loss has resulted from factors including urban development, agriculture, and other land-use changes that have significantly altered these vital ecosystems. Wetlands play a crucial role in biodiversity, water quality, and flood control, making their loss a significant environmental concern. By understanding the extent of wetland loss, we can appreciate the importance of conservation efforts aimed at preserving and restoring these critical environments. While the other percentages represent noticeable losses, they do not reflect the broader observations and studies indicating that 40% is a more accurate estimate of the total wetland loss.