WASHINGTON - The annual State of the Climate Report, compiled by more than 450 scientists from over 60 countries, describes worsening climate conditions worldwide in 2017, the same year that US President Donald Trump pulled out of the landmark Paris climate deal.
The United States is the world´s second leading polluter after China, but has rolled back environmental safeguards under Trump, who has declared climate change a "Chinese hoax" and exited the Paris deal signed by more than 190 nations as a path toward curbing harmful emissions.
The 300-page report issued by the American Meteorological Society and the National Oceanic and Atmospheric Administration (NOAA) mentioned the word "abnormal" a dozen times, referring to storms, droughts, scorching temperatures and record low ice cover in the Arctic.
Here are its key findings:
* Greenhouse gas surge*
Last year, the top three most dangerous greenhouse gases released into Earth´s atmosphere -- carbon dioxide, methane and nitrous oxide -- reached new record highs.
The annual global average carbon dioxide concentration at the Earth´s surface climbed to 405 parts per million, "the highest in the modern atmospheric measurement record and in ice core records dating back as far as 800,000 years," said the report.
"The global growth rate of CO2 has nearly quadrupled since the early 1960s."
The record for hottest year in modern times was set in 2016, but 2017 was not far behind, with "much-warmer-than-average conditions" across most of the world, it said.
Annual record high temperatures were observed in Argentina, Bulgaria, Spain and Uruguay, while Mexico "broke its annual record for the fourth consecutive year."
Smashing more heat records, temperatures reached 110.1 degrees Fahrenheit (43.4 Celsius) on January 27 at Puerto Madryn, Argentina, "the highest temperature ever recorded so far south anywhere in the world."
The world´s highest temperature ever for May was observed on May 28 in Turbat, western Pakistan, with a high of 128.3 degrees Fahrenheit.
"The 10 warmest years on record have all occurred since 1998, with the four warmest years occurring since 2014," said the report.