Current models too simplistic . To date, many Earth systems have been shown to be susceptible to tipping, raising the spectre of irreparable catastrophes such as the disappearance of the Amazon rainforest, melting ice sheets and desertification. However, such predictions are typically based on simple conceptual models with only two alternative states, according to the study. The authors argue that in more complex models, tipping is often not as severe, causing, for example, only parts of an...