One of three scam artists behind a $54 million ponzi scheme was sentenced to prison for her role in the biggest ‘green energy’ scams in US history, according to NBC New York. 35-year-old Amanda Knorr of Hellertown, Pennsylvania received just 30 months in federal prison for a ponzi scheme involving her 2005 startup, Mantria, in which “many people lost their life savings,” according to assistant US Attorney Robert Livermore following Knorr’s sentencing…