the mild warming of around 0.8 degrees celsius that the planet has experienced since the middle of the 19th century
the mild warming of around 0.8 degrees celsius that the planet has experienced since the middle of the 19th century
earth:174
without this heat-retention effect, the average surface temperature would be −18 °c (0 °f), in contrast to the current +15 °c (59 °f), and life on earth probably would not exist in its current form.