The Planet of Life
The Planet of Life is a scientific documentary that explores the characteristics necessary for life as well as characteristics of life itself. Appearances from professors with prestigious university affiliations, and use of relevant graphics throughout feel appropriate for the style of documentary, and the information is free of opinion or apparent bias.
However, at one point you might wonder whether or not the film's creators are trying to get audiences to arrive at a particular point, specifically when they suggest that the introduction of oxygen had been a "technical pollutant" that made earth an optimal place for the existing species (humans and animals). This feeling returns later in the film when the documentary's narrator suggests that we may consciously create a race of similar descendants in the future with mechanical integration capabilities