Resumen de Earth now halfway to warming limit
With an El Niño now under way and predicted to intensify, it looks as if the global average surface temperature could jump by around 0.1°C in just one year. The UN negotiations on climate change aim to limit warming to 2°C above pre-industrial temperatures. There is, however, no agreement on how to define pre-industrial temperature, says Ed Hawkins of the University of Reading, UK
