The student loan burden is reaching crisis proportions. Young Americans are being saddled with unsustainable debts. A New York Federal Reserve Bank study found that a stunning 43 percent of 25-year-olds had student loan debts in 2012. Debt now averages over $25,000 for graduates of four-year colleges. Student loan debt now is about $1 trillion. The only kind of household debt that continued to rise through the recession, student loans now exceed credit card debt and rank second only to mortgages. The percentage of borrowers who are more than 90 days delinquent has risen to 17 percent, up from 10 …