Australia's biggest-ever environmental battle was over a wild river in a remote part of Tasmania: the Franklin. Protesters flooded in from all over Australia to stop the Franklin River from being dammed for hydropower. They stood in front of bulldozers and were jailed for it. But for lots of locals, the dam represented a job opportunity at a time of economic crisis. This fight tore apart communities and captured the attention of the nation.

Today, more people are concerned about the planet than ever before…so in a fight for the environment, this season of Dig investigates: What does it take to win?