Story highlights Morgan Spurlock's 'Rats' looks into the underworld of the rodentLeonardo DiCaprio's documentary "Before the Flood" explores climate change(CNN) Morgan Spurlock's "Rats" is shrewdly billed as a "horrormentary." Yet of the two worthwhile, globetrotting documentaries premiering this week, Leonardo DiCaprio's "Before the Flood" -- a deep dive into the subject of climate change -- might be the more terrifying. DiCaprio, of course, is hardly the first actor to lend his celebrity to promoting the issue. "Years of Living Dangerously," for example -- which returns on National Geographic Channel, moving from Showtime -- enlisted a host of stars to explore different environmental concerns. allowfullscreen>DiCaprio, however, is clearly no Leo-come-lately but rather puts in the work and time -- visiting five continents, including the Arctic, China and India.

Source: CNN October 21, 2016 20:03 UTC