Do you crave the enriching history of Ken Burns’s celebrated documentary series The National Parks: America’s Best Idea (2009) but don’t have 12 hours to spare? The US filmmaker Ryan Maxey has a droll and delightful short film that will give you the broad strokes in just four diligently researched minutes. With a collage style and a muzak soundtrack, (Unofficial) History of the National Parks aims to entertain, but ultimately arrives at a deeper question about humanity’s potential for curbing its most self-destructive impulses.