Guardian: Massive new oil finds off the southern states of America and Brazil plus exciting discoveries in currently non-producing countries such as Ghana and Uganda sit uneasily with claims the world is running out of crude. BP recently boasted about a “giant” strike on the Tiber field in the Gulf of Mexico and BG, the former exploration arm of British Gas, talked of its “supergiant” at the Guará prospect off South America, yet critics argue they cannot make up for the fast depletion of …