claim: “Instead of a three-foot increase in ocean levels by the end of the century, six feet was more likely, according to DeConto and Pollard’s findings.
evidence: Historically, the clarity of Lake Tahoe continued to decrease through 2010, when the average Secchi depth, 64.4 feet ( 19.6 m ), was the second lowest ever recorded ( the lowest was 64.1 feet ( 19.5 m ) in 1997 ).