September 2018 ranked as the fifth-warmest September on record dating back to 1895, with monthly temperature anomalies shown on this map. Image: NASA

September 2018 was the planet's fifth-warmest September on record, and the world is poised to record its fourth-warmest year, according to new data NASA released Monday.

Why this matters: According to Gavin Schmidt, the director of NASA's Goddard Institute for Space Studies in New York, 2018 is also likely to be the fourth year in a row with an average temperature of 1ºC, or 1.8ºF, above the 19th century average. A recent climate report from the UN warned of severe consequences if global warming is not limited to 1.5ºC, or 2.7ºF, above average, compared to preindustrial levels.

The details: During September, the eastern U.S. was much warmer than average, as was Europe, the Russian Arctic and Alaska. South America, Africa and Australia were also warmer than average. In fact, Earth's only cool spots during September could be found in northwest Canada, parts of the North Atlantic near Greenland and northeastern Antarctica.

Based on data from the National Oceanic and Atmospheric Administration, which also keeps tabs on global temperatures:

  • The five warmest years in the global record have all come in the 2010s.
  • The 10 warmest years on record have come since 1998.

The big picture: With an El Niño event developing in the tropical Pacific Ocean, it's likely that 2019 will be warmer than 2018, since such events tend to transfer more heat from the oceans to the atmosphere.

  • The scientific community has concluded that human-caused emissions of greenhouse gases are behind the sharp warming trend seen in recent decades and that only sharp cuts in such emissions can reverse such a trend.

Between the lines: President Donald Trump, however, may disagree with this conclusion, saying in an interview with "60 Minutes" that aired Sunday that he's not sure if climate change is "man-made."

"I think something’s happening. Something’s changing and it’ll change back again. I don't think it's a hoax, I think there's probably a difference. But I don't know that it's man-made."

Go deeper: Key global warming target slipping out of reach, UN scientists warn

Go deeper

Updated 7 mins ago - Politics & Policy

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Politics: Pence chief of staff Marc Short tests positive for coronavirus — COVID-19 looms over White House Halloween celebrations
  2. Health: Fauci says maybe we should mandate masks if people don't wear them — America was sick well before it ever got COVID-19
  3. World: Polish President Andrzej Duda tests positive for COVID-19.

Pence chief of staff Marc Short tests positive for coronavirus

Marc Short with Katie Miller, Vice President Pence's communications director, in March. Photo: Doug Mills/The New York Times via Reuters

Marc Short, Vice President Mike Pence’s chief of staff, tested positive for the coronavirus Saturday and is quarantining, according to a White House statement.

Why it matters: Short is Pence's closest aide, and was one of the most powerful forces on the White House coronavirus task force.

3 hours ago - World

Opposition leader Leopoldo López flees Venezuela

Venezuelan opposition politician Leopoldo López outside the Spanish embassy in Caracas, in 2019. Photo: Juan Barreto/AFP via Getty Images

Leopoldo López, a former political prisoner and prominent Venezuelan opposition leader, has left the country, his Popular Will party confirmed in a statement Saturday.

Why it matters: He's been an influential force in the push to oust President Nicolás Maduro's regime and a mentor to opposition leader Juan Guaidó. He'd been in the Spanish ambassador's Caracas residence since escaping house arrest in April 2019 following a failed military uprising.