Transcripts for KPIX CBS Evening News With Scott Pelley 20170527 00:46:00

>> reporter: jerry lorenz of florida's audubon society says the fresh water the birds need is disappearing, and the entire ecosystem is at risk. what have we done to the wherglades? >> well, the biggest thing we've done is drained it. >> reporter: for? >> for our purposes. >> reporter: development, farming. >> development, agriculture. this was the big land boon. there were people who looked at that swamp and said, "what a waste of land. it's fertile soil. d.t's drain it." >> reporter: case in point-- this view of one part of the glades in the 1970s. this is just 30 years later. the effect has been to cut off the vital natural flow of fresh water from the kissimmee river and lake okeechobee all the way to florida bay. the disruption contributed to recent toxic algae blooms. now almost 20 years after lawmakers passed a comprehensive everglades restoration plan, the florida legislature finally approved a key project, a $1.5 billion reservoir designed to help restore some of that natural flow.

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