What’s Tipping & What’s Toppling ?

Here’s the research paper that Tim Lenton co-authored :-
http://www.pnas.org/content/105/6/1786.full.pdf

http://researchpages.net/ESMG/people/tim-lenton/tipping-points/

What’s toppling already in the Earth System ?

http://www.pethacker.com/tara-lohan-thanks-to-climate-change-you-can-kiss-these-8-amazing-things-goodbye