The current mass extinction has been unfolding
for millennia, and unlike the greenhouse effect,
global warming, or the hole in the ozone, it is
visible without sophisticated imagery or complex
computer modeling. It is real, and it is happening
to a greater or lesser degree all over the globe;
it is most apparent, however, in the tropics.
It will not eliminate life from the Earth; no
mass extinction does that. But enough species
will die that the nature of life on the Earth
will be forever changed.