For the second year in a row, Texas has closed the majority of its public oyster reefs for harvesting due to declining populations. Wildlife officials say these dwindling numbers are caused by extreme weather events fueled by climate change, as well as by overharvesting. For the oystermen who make a living from harvesting oysters in the Gulf of Mexico's Galveston Bay area during a season that normally runs from November through April, these closures mean a hit to their business.