The titanic debate over a Siberian lake that's led thousands of Russians to call on the Hollywood star to #saveourbaikal.
For the past week, Leonardo DiCaprio's (pictured here with fellow actors in 2013) Instagram feed has been overwhelmed with thousands of pleas such as "Leo, please! Help us #savebaikal." So why Leo, and why now?
Amos Chapple is a New Zealand photojournalist with a particular interest in the former U.S.S.R.