The Earth's climate system is a vastly complicated lumbering beast, but what happens when humans prod it with a greenhouse stick? Surely humans are small and insignificant creatures but the planet is large. That may have been true once, but not any more.

Professor Will Steffen is a Council of Australia councillor. Read his SMH article about Penrith swelters while Florida freezes. Inez Harker-Schuch is the creator of a game to teaches climate science. Inez describes how the Milankovitch Cycles affect climate.

We play an extract of an interview with Clive Hamilton. You can hear the full interview with Clive here.

Interviews by Rod