Weeds: Enemy or ally

Background Briefing · Jun 30, 2007 · 49m

There's an invasion of noxious weeds on the way as the planet heats up and dries out. Invasive plants could flatten Australia's native vegetation, blowing out current costs of about $8 billion a year. Warnings abound that we don't understand these plants - including from people who say that some weeds can do a good job. Reporter Diane Martin.