US to lead oil output growth through 2030: ConocoPhillips chief economist   Global oil demand expected to rise modestly to 2030 Refining capacity will adapt to lighter US crudes US crude export constraints seen as temporary   The US will lead global oil production growth for the next decade, and tight oil can continue to grow beyond the 2030s even moderate prices, ConocoPhillips chief economist Helen Currie told S&P Global Platts Tuesday. ConocoPhillips exp