A report by U. S. scientists points out that the combined value of coastal wetland ecosystems per hectare each year is $ 4025, equivalent to 2 times the equivalent area of rainforest, or 13 times that of other forests, or 17 times that of grasslands, or that of farmland.44 times! Understanding of "value" in a sentence. What is incorrect? ['Coastal wetlands are special ecosystems with rich biodiversity.', 'Coastal wetlands have an irreplaceable role in global ecological balance.', 'Coastal wetlands have high biological productivity and important coastal protection functions.', 'Coastal wetlands can create high national economic value for coastal areas.']