U.S. markets set to open higher, signaling the index will rebound after its worst week since June 2012. In Europe, stocks fell as China and Indonesia led a drop in emerging markets. In the commodities space, US natural gas climbed to their highest level since February 2010 with the polar vortex set to make a return appearance this week. January is on track to be the coldest month of the century in the lower 48 states. In corporate news, Caterpillar is back up above $92. The heavy equipment maker says earnings and revenue topped analyst estimates. Caterpillar also said it approved a $10 billion buyback plan. TheStreet's Senior Stock Analyst Nicole Urken has more from Wall Street.