Trading in the U.S. index futures suggests that Wall Street stocks may open lower yet again on Tuesday, as China worries and global growth concerns triggered by oil’s relentless move downward continue to haunt traders. The global markets are being sold off, with China’s 6 percent plus tumble spoiling Asia’s party earlier in the global trading. Notwithstanding some positive domestic corporate news and a lack of any major economic news, the European markets are also declining.