Overview: Hamish Macdonald hosts a conversation on climate solutions. Joining him live in Melbourne to discuss how businesses and individuals are tackling the climate challenge are: Osher Günsberg, TV and radio host; Jennifer Westacott, Business Council of Australia CEO; Sophia Hamblin Wang, Sustainability entrepreneur; Matt Evans, chef and farmer; and Audrey Zibelman, Australian Energy Market Operator CEO. There is also a musical performance from Paul Kelly.