By Caroline Valetkevitch NEW YORK (Reuters) – Stocks on global indexes rose on Thursday as U.S. Treasury yields fell to a two-week low, while copper was at 16-month lows amid fears of a global economic slowdown. Fed Chairman Jerome Powell is testifying before Congress for a second day Thursday, a day after saying the Fed is committed to cutting inflation at all costs, and acknowledged a recession was “certainly a possibility.” Investors have been weighing the risk of hefty interest rate rises tipping economies into recession. “What we’re seeing here is a (stock) market trying to absorb the Fed…