Last month was the fourth warmest September on record

Firefighters monitor the Mosquito Fire, California's current largest blaze, which swept through nearly 50,000 acres in the Sierra Nevada Mountains in September. Globally, according to Copernicus data, it was one of the warmest Septembers. Photo: Joash Edelson / AFP

Last month was the fourth warmest September on record, with Greenland in particular showing ominous signs of the stark reality of climate change, data show.

According to analysis from the EU's Copernicus Climate Change Service (C3S), while Europe had a month that was cooler than recent norms, conversely the rest of the planet was warmer than average, equalling 2016 as the fourth warmest on record.