Ron Naveen, subject of documentary “The Penguin Counters,” counts a rookery of chinstrap penguins in Antarctica. The film follows Naveen and his team’s research on penguin populations and their strategies for coping with climate change. The film by D.C. filmmakers Harriet and Peter Getzels is a highlight of the 23rd annual Environmental Film Festival in the Nation’s Capital. (Photo by One Ocean Expeditions). (Photo by One Ocean Expeditions/Photo by One Ocean Expeditions).