For a second consecutive month, OPEC revised down its global oil demand growth estimate for this year and next, pointing at a combination of factors that could slow down global economic growth. In its closely watched Monthly Oil Market Report published on Wednesday, OPEC revised down world oil demand growth for 2018 by around 20,000 bpd, primarily as a result of the slower-than-expected performance by Latin America and the Middle East in the second quarter. Global oil demand growth is now pegged at 1.62 million bpd, with total global consumption…