The era of falling breakeven costs in the U.S. shale patch may soon come to an end, and a new era of higher costs and depleted core inventory could reduce America’s sway in meeting the global demand growth. That’s the latest take from analytics firm Enverus Intelligence Research, which said in a new report this week that the marginal cost of U.S. oil supply is projected to rise from $70 per barrel WTI price at present, to as much as $95 per barrel by the mid-2030s. The expected $15 per barrel surge in costs would be driven by a shift…