The world’s largest alpine lake and a California jewel is being littered with plastic. In a study published late last year in the journal Applied Spectroscopy, scuba divers found 673 pieces of plastic in the lakebed of Lake Tahoe at five different locations, raising concerns about the extent of plastic pollution across the lake. Researchers found that the greatest source of pollution was degraded pieces of plastic followed by food containers, bottles, plastic bags and toys. The highest concentrations of plastics were found in recreation areas such as Hidden Beach and South Sand Harbor. These a…