US STOCKS-Indexes open lower on last day of year
* S&P 500 turns negative for year
* Apple weighs on S&P 500, Nasdaq; McDonald's drags Dow
* Energy sector worst performer on S&P 500 for year
* Indexes down: Dow 0.57 pct, S&P 0.49 pct, Nasdaq 0.46 pct (Updates to open)
By Abhiram Nandakumar
Dec 31 (Reuters) - U.S. stock indexes were lower on Thursday morning, with the S&P 500 slipping back into negative territory for the year, as crude logged in a second year of steep losses.
The rout in commodities has sent markets across the world reeling as oil prices were hit by an unprecedented global glut that may take another year to clear.
Shares of Chevron were off 1 percent at $89.21, while Exxon was down 0.7 percent at $77.61.
Energy stocks have taken a beating this year, with the S&P energy sector losing nearly 24 percent this year, followed by a near 10 percent loss in materials. Continuación...