Baltimore Sun: High in the Silvermine nature reserve, proteas here and there unfurl skyward like floral fireworks in soft pink and yellow. Guy Midgley’s eye is drawn elsewhere, though, to ugly brown lesions on the otherwise green landscape – dead protea plants. "Nobody’s quite sure what’s going on," says Midgley, a plant scientist, scanning the bushy vegetation. But he suspects global warming is behind the recent protea "die-back," in which one-third of the plants have shriveled …