Yet the authors' aim is precisely in the opposite direction, to call into question this country's approach to the problem of species extinction.

Already there are diverse religious groups addressing issues like species extinction and global warming.

Another speaker this year actually used the term "species extinction," referring to ours.

But again, it sets up an international process for long-term management of the problem of species extinction.

The supercollider can wait, but population growth and species extinction need prompt attention.

Biologists tell us we have entered a period of catastrophic species extinction.

The reserve's small size and isolation from other natural areas also make species extinction a much greater risk.

Environmental concerns and threats of species extinctions move to center stage on prime time.

Hansen describes the situation with species extinction similarly to that of sea level rise.

Our planet is currently experiencing a catastrophic rate of species extinction.