Q&A is in Melbourne with a Future Alert special hosted by Annabel Crabb.With war, rampant disease, food shortages and a poisoned environment all threatening human survival, Q&A brings together some of the nation's best minds to discuss how we confront these threats and whether our political system is capable of addressing them.On the panel:Former Liberal party leader: John HewsonScience communicator and food security expert: Julian CribbInventor and sustainability engineer: Veena SahajwallaFuturist: Jordan NguyenAustralian Futures Project Program Director: Chloe Spackman