Throughout his television career, Attenborough had, by and large, purposely avoided specific references to the effect of humans on the ecology of the planet. He saw his role simply as a presenter of programmes on natural history. However, the final episode of "The Living Planet" (1984) had been devoted to man's own habitat and his destruction of others, and in later years, Attenborough started to become more outspoken about the subject. The three-part "State of the Planet" in 2000, and the last instalment of "The Life of Mammals" (2002), which dealt with the evolution of "Homo sapiens" and subsequent overpopulation, were explicit in this regard.