Re: Species extinction and man?

In the course of evolution, life has originated diversified to occupy the various ecological niches on Earth. Adaptation brought out by variations and natural selection led various species to "exploit" a particular niche. Some species are highily specialized (i.e highly efficient) at living in a particular environment. Earth's physical evolution and the biological evolution went on and still are going on hand-in-hand. In our very brief life span, we perceive Earth to have a constant (unchanged) environment. In terms of thousands and millions of years Earth's environmental conditions do change. Those species that are highly specialised to a particular niche become extinct when that niche gets modified/altered/removed from the face of the Earth since the adaptations were too specific to the original niche. Species that are less specialised to a niche will have a better surivival value as they have the flexibility to changes. Humans are in a sense specialized in "non-specialization". We don't have a strict/particular diet preference (vegetarian/non-vegetarian etc) or living conditions (thanks to our "cultural evolution", human beings are the only species who can modify the environment to suit his own. Think of modern agricultural practices and the air conditioning and heating systems in your home!). Since we are NOT specialised the chances of extinction of our species is very remote. Remember, our species can survive (in any other planet of our solar system or elsewhere) even when the Earth becomes too hostile for life to exist.