The interesting thing here is not so much the beliefs and arguments about near term extinction, the anthropocene and the systemic collapse of civilisation but the sociology around reactions to it's possibility.

I'm sure it's not complete, but the New Political Map is a fairly exhaustive description of those reactions. It divides mainly into Collapseniks vs Salvationists with some fence sitters.  It's not hard to recognise quite a few of those groups in current media discussions of things like Climate Change.

Of course, as usual this mainly refers to people in WEIRD[1] countries and ignores the other 6 Billion people on Spaceship Earth. What and how do they think?

http://shift-magazine.org/wordpress/wp-content/uploads/2014/11/new-political-map-2014-image-for-Dave-Pollard-article.png

http://shift-magazine.org/magazine/see-no-evil-the-morality-of-collapse/

[1]http://en.wikipedia.org/wiki/Psychology#Systemic_bias
WEIRD ("western, educated, industrialized, rich and democratic")