Charges that a public TV reporting initiative about pensions is ethically compromised by its funding sources led to a fiery exchange today between the funder in question and reporter and columnist David Sirota, who leveled the claims in an article for the Silicon Valley news site PandoDaily. Sirota pointed out in his story that The Pension Peril, a two-year reporting initiative produced by New York’s WNET, receives most of its funding from the Laura and John Arnold Foundation. Co-founder John Arnold, a hedge-fund manager and former trader for Enron, has contributed to political campaigns urging state lawmakers to reduce pension benefits for public employees, according to Sirota. WNET largely neglects to disclose the relationship, Sirota wrote, though he did turn up a reference on a Pension Peril report’s web page. According to WNET, The Pension Peril has so far delivered reports for two shows that it produces: PBS NewsHour Weekend, which PBS distributes nationally, and Long Island Business Report, which airs on WNET’s Long Island outlet. The reporting project examines “the deficit in funding for public employees’ retirement benefits,” according to a news release from the station.