The threatening thaw: climate professor on heatwave risks to tipping point of permafrost — Jonathan Watts, The Guardian, https://www.theguardian.com/environment/2026/aug/20/tipping-points-heatwaves-wildfires-permafrost-climate-crisis The environment is non-linear, including non-proportionate reactions, feedback loops (positive and negative), critical (“tipping”) points, and practically irreversible phase changes. The permafrost has been my go-to example for this for 30 years (https://www.taylorfrancis.com/books/mono/10.4324/9781315070711/sustainability-tony-clayton-nicholas-radcliffe). The situation was urgent 30 years ago; it is far more urgent now. #environment #climate #emergency #nonlinearity