By Barbara Kollmeyer MADRID (MarketWatch) -- Crude-oil futures slid in European trading hours on Wednesday, as investors turned risk averse in face of fresh concerns that Greece could exit the euro. Oil for June delivery CLN2 -1.01% fell 86 cents, or nearly 1%, to $90.97 a barrel. Natural gas for June delivery NGM12 -0.67% fell 2 cents, or 0.6%, to $2.92 per million British thermal units. Global stocks and commodities fell and the dollar rose after former Greek Prime Minister Lucas Papademos said Tuesday in an interview with Dow Jones Newswires that considerations in the country were being made regarding a euro exit, which would come at a high cost if it happened. He backtracked on the comments in an interview with CNBC, but hit sentiment nonetheless as markets awaited a European Union informal summit for later Wednesday. Supply data is also in focus for oil, with the Energy Information Administration expected to release its report Wednesday. Ahead of that, late Tuesday the American Petroleum Institute said crude-oil supplies rose 1.5 million in the week ended May 18.

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