One of Australian farmers’ few remaining advantages over cheap foreign imports is their reputation as producers of clean and green food and fibre, writes Peter Westmore.Following a six-month study, the independent Quarantine and Biosecurity Inquiry, headed by a former head of the Prime Minister’s Department, Roger Beale, is shortly due to report to the Minister for Agriculture, Tony Burke.The inquiry is the first full-scale review of Australia’s quarantine system since 1996, and follows an inqui…