By Mike Dolan Jan 20 - What matters in U.S. and global markets today By Mike Dolan, Editor-At-Large, Finance and Markets U.S. President Donald Trump’s tariff threats over Greenland are unnerving global markets as Wall St returns from Monday’s holiday, with stock futures, Treasuries and the dollar under pressure and safe-haven gold and silver touching new all-time highs. The ​moves are contained thus far, but the VIX volatility index, the so-called fear gauge, has leapt to its highest point of the year, ...