CNBC will premiere “Dollars & Danger: Africa, The Final Investing Frontier,” a special about the investment opportunities in the richest continent, on Wednesday. Africa has more gold, cobalt and diamonds than anywhere else in the world. Many Americans are unaware that Africa sells more oil to America and China than the Middle East. ­ However, Africa also has its dangers. Countries like Libya and Nigeria are embroiled in wars and tribal conflicts. But in this tough economy, some American companies are willing to overlook the violence. The CNBC special will include interviews from top executives who’ve invested billions in Africa because they believe in the continent’s profitability. The show airs at 9 p.m., 10 P.M., and 1 A.M. EST.—MB