Which of eight speeches of Wangari Maathai have style prevalence?

It is difficult to determine which of Wangari Maathai's eight speeches has a style prevalence without specific examples or analysis of each speech. However, it is likely that her speeches on environmental conservation, women's empowerment, and social justice may have a consistent style that emphasizes passion, urgency, and a call to action. Further analysis would be needed to determine which speech has the most prevalent style.

I cannot answer the question because the reference to eight speeches of Wangari Maathai is missing from the context. Please provide the complete reference to the eight speeches in order for me to answer the question accurately.