While fierce desert winds, drought and arson have been blamed for the wildfires which took 20 lives and destroyed over 2000 homes in southern California last month, the underlying causes – the failure to conduct fuel-reduction burns, under pressure from American greenie groups such as the Sierra Club and the Wilderness Society – have received little attention.Southern California, like much of Australia, is subject to periodic droughts and scorching summer winds.It has also had an increasing numb…