He’s been called the most successful environmentalist in Australian history, and one of the most influential in the world.

Former Senator Bob Brown co-founded the world’s first Green Party, in Tasmania in 1972. He led the Australian Greens in Parliament for decades and spearheaded a pivotal moment in global environmentalism, when he helped save the pristine Franklin River from being dammed.

Senator Brown joined Josh in Sydney to talk about his life of protest and purpose, from heckling President George W. Bush to being openly gay when it was still illegal. They discuss the phoney choice of voting for major parties, the pickle the modern left finds itself in, and why love and wildness are the keys to saving the planet.

His new book is Defiance: Stories from Nature and Its Defenders.