Johan Rockstrom — Environmentalist

Johan Rockström is executive director of the Stockholm Resilience Centre, and teaches natural resource management at Stockholm University. He is a strategist on how resilience can be built into land regions which are short of water, and has published over 100 papers in fields ranging from practical land and water use to global sustainability. Johan Rockström was Executive Director of the Stockholm Environment Institute from 2004-2012... (wikipedia)

We see evidence that lakes and forests and wetlands can have different equilibria - so you have a savanna system that may be stable and thriving, but it can also tip over and become an arid steppe if pushed too far by warming, land degradation, and biodiversity loss.
Paleoclimatic records show clearly that the past 10,000 years, the Holocene, is a remarkably stable period in which we went from being a few hunters and gatherers to become more sedentary agriculture-based civilizations, which then moved us to the current populated modern era.