Christian Science Monitor: More than a century ago, naturalist John Muir urged urban dwellers in bustling Eastern cities to look up from their labors and head west to a national park for a fresh perspective. “Nature’s peace will flow into you as sunshine flows into trees,” wrote Muir in 1901. “The winds will blow their own freshness into you and the storms their energy, while cares will drop off like autumn leaves.” Beginning this Sunday America’s premier documentary filmmaker, Ken Burns, issues that …