LONDON (Reuters) - Credit rating agency S&P Global slashed its global forecasts on Thursday, predicting coronavirus lockdowns would now see the world economy contract 2.4% this year and cause the United States and euro zone to slump 5.2% and 7.3% respectively.Though the projections were not as dramatic as the 3% global contraction forecast by the International Monetary Fund earlier in the week, S&P's move is likely to fan worries about further sovereign and corporate rating downgrades."The data..