Explanation:

Loss of natural habitat, illegal commercial trade of wildlife, and fast pace of population growth are widely recognized as major causes of wildlife extinction. While setting fire to forests (forest fires) directly leads to habitat destruction and loss of life, it can be seen as a *mechanism* or *event* that contributes to habitat loss, rather than a standalone 'major cause' in the same category as the broader ecological and demographic pressures. However, it's important to note that large-scale forest fires are indeed a significant threat to wildlife.