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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.

A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.

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

New York prepares for staff shortages from health vaccine mandate

New York Gov. Kathy Hochul during a news conference Tuesday in New York City.. Photo: Mark Kauzlarich/Bloomberg via Getty Images

Gov. Kathy Hochul (D) announced Saturday she would declare a state of emergency if there were health worker shortages due to New York's upcoming COVID-19 vaccine mandate.

Why it matters: Hochul moved to reassure concerns of staffing shortages in the health care sector in a statement that also outlined plans to call in medically trained National Guard members, workers from outside New York and retirees if necessary when the mandate takes effect Monday.

California to remove word "alien" from state laws

Gov. Gavin Newsom during a September news conference in Oakland, California. Photo: Jane Tyska/Digital First Media/East Bay Times via Getty Images

California is removing the word "alien" from its state laws and replacing it with words such as "noncitizen" and "immigrant," Gov. Gavin Newsom (D) announced.

Why it matters: The word "alien" began to be used in the 1990s "as a political dog whistle to express bigotry and hatred without using traditionally racist language," per a statement from Newsom's office.

7 hours ago - Health

Axios AM Deep Dive: Covid forever

Illustration: Aïda Amer/Axios

It was 563 days ago that the WHO declared Covid-19 a pandemic. This Axios AM Deep Dive, led by healthcare reporter Caitlin Owens, looks at our Covid future.