On the final day of the Planet in Focus film festival in Toronto last fall, the packed house at the Royal Cinema felt every aching step of Jon Muir's 2,500-kilometer trek in the documentary "Alone Across Australia." When the death of Muir's dog made his adventure truly a solo act, he quietly sobbed and rocked his dead companion, and there wasn't a dry eye in sight. The movie's blend of adventure, endurance, and devotion had sparked a passionate response -- a common occurrence at the continent's growing number of green film festivals. There aren't many scintillating documentaries about health care …