The 2C temperature limit: A "defense line," not a "guard rail"

Just in case you were wondering, a key “Structured Expert Dialogue” between IPCC scientists and UNFCCC negotiators has just released its technical summary. And, happily, it has been digested by the Climate Analytics team into this short, clear overview.
This SED is news because it essentially confirms the arguments that the Small Island Developing States and the Least Developed Countries have been making for years, that 2°C warming limit is too high. And that it must not be crossed.