Last spring‚ the White House proudly rolled out new proposed regulations on tailpipe emissions as part of its effort to speed up the country’s embrace of electric vehicles. The rules were supposed to be finalized next month. Now officials are backtracking. “Instead of essentially requiring automakers to rapidly ramp up sales of electric vehicles over the next few years‚ the administration would give car manufacturers more time‚ with a sharp increase in sales not required until after 2030‚”...