“In such a temperature, you won’t need a sweater.”
Luboš Motl reports at the Reference Frame:
The current global average mean temperature is about 15 °C. However, Colin Goldblatt and Andrew J. Watson have submitted a preprint called “The Runaway Greenhouse: implications for future climate change, geoengineering and planetary atmospheres” to the Royal Society which discusses a balmier temperature that we may expect soon: 1,100 °C. In such a temperature, you won’t need a sweater.