[PatrickHenry]

How can extinction rates be estimated by way of an estimated 10% sample of an unknown (but estimated) survey population?

Probably the environmentalists are using the same incredibly refined techniques as those used to estimate that there are 3 million homeless in the US. The numbers seem to come from the Seventh Planet.

[RadioAstronomer]

Probably the environmentalists are using the same incredibly refined techniques as those used to estimate that there are 3 million homeless in the US. The numbers seem to come from the Seventh Planet.

LOL!

[Sabertooth]

Probably the environmentalists are using the same incredibly refined techniques as those used to estimate that there are 3 million homeless in the US. The numbers seem to come from the Seventh Planet.

Or perhaps the sixth, making it a stastical analysis by attenuation?