So there is this craze about global warming. The former U.S. presidential candidate Al Gore is enlightening the public ("An Inconvenient Truth), and the level of awareness among laypeople is justifiably rising.
Given the robustness and diversity of phenotypes, I personally think life as a whole will cope, no matter what happens to the earth's environment, within the range of what is predicted in the phenomenology of climate change.
Global warming has been created by human civilization, and is a menace to human civilization as we know it. It serves our self-interest to tend to this problem seriously.
The disappearing species due to an environmental change will be replaced by newly emerging ones in the long term, as is evidenced by, for example, the "Cambrian explosion" after the end of the "snowball earth" period. The argument that global warming will destroy the existing species is thus based on our sentimental attachment to the present world in which we find ourselves in.
The makers of the film "An Inconvenient Truth" was hitting the right spot when a beautiful river scene was inserted to depict the loveliness of the earth. Sentimentality is an expression of the instinct of self-perpetuation, the foundation for all that is life.