Scientists say human activity has so profoundly changed the earth that we’re now living in a new epoch, the Anthropocene. Our age is marked by mass extinctions, pollution and climate change. Yet we’re slow to comprehend the scale of the problem or to act to avert disaster. That’s why we need radical histories for these uncanny times. Listen to Tom Griffiths' lecture in the Sydney Environmental Humanities Lecture Series on ABC Radio National Big Ideas.  Forthcoming lectures