The World Wetlands Day was observed across the globe including Bangladesh yesterday recalling that healthy wetlands and the water they are providing are vital for life and biodiversity, reports BSS. Wetlands play a number of roles in the environment, principally water purification, flood control and shoreline stability. Since 1971, the Ramsar Convention is observing the day. This year, the theme of the day is "Wetlands for our Future: Sustainable Livelihoods". Mentioning a study conducted by SPARSO, there was 130 acre of wetland in Dhaka in 1968 and it was found only 63 acre in 2001. But now, the city has lost more than 60 percent of wetland in last 30 years, the environment expert said.