Okay, so we’ve accepted that the trees promised by the Grand Prix’s penniless — and since dismissed — Baltimore Racing Development company probably aren’t coming through (the ground). But we’re breathing easier to hear about the State Highway Administration’s upcoming efforts to plant a whopping 28,000 trees — plus, the additional plantings in store by another vital program, TreeBaltimore. In light of a new study by the U.S. Forest Service, revealing that 17 of 20 U.S. cities have lost tree cover, with Baltimore’s leafy loss among the worst of the bunch, we need good green news just now.