Flannery writes that "The use of fire by Aboriginal people was so widespread and constant that virtually every early explorer in Australia makes mention of it. It was Aboriginal fire that prompted James Cook to call Australia 'This continent of smoke'. " However, he goes on to say: "When control was wrested from the Aborigines and placed in the hands of Europeans, disaster resulted. " Fire suppression became the dominant paradigm in fire management leading to a significant shift away from traditional burning practices. A 2001 study found that the disruption of traditional burning practices and the introduction of unrestrained logging meant that many areas of Australia were now prone to extensive wildfires especially in the dry season. A similar study in 2017 found that the removal of mature trees by Europeans since they began to settle in Australia may have triggered extensive shrub regeneration which presents a much greater fire fuel hazard. Another factor was the introduction of gamba grass imported into Queensland as a pasture grass in 1942, and planted on a large scale from 1983. This can fuel intense bushfires, leading to loss of tree cover and long-term environmental damage.