New York Times: When the German government developed its pioneering cash-for-clunkers program, it neglected one small detail: making sure the clunkers no longer clunked. Police investigators have concluded that the alluring premise of the program – providing generous incentives to people who replace aging, pollutant-spewing vehicles with environmentally friendly models – is being undermined as cars that were supposed to have been junked are finding their way to markets in Africa and Eastern …