Sci-tech

2017 top 3 warmest year: USA agencies

2017 top 3 warmest year: USA agencies

1998, for instance, was at the time a record year for global temperatures, as it coincided with a very strong El Nino - but 2017's temperature now comfortably surpasses it.

The finding by the National Aeronautics and Space Administration (NASA) follows three years in a row in which global temperature hit a new record.

"Seventeen of the 18 warmest years on record have all been during this century, and the degree of warming during the past three years has been exceptional", Mr. Taalas pointed out, stressing: "Arctic warmth has been especially pronounced and this will have profound and long-lasting repercussions on sea levels, and on weather patterns in other parts of the world".

Analysis by NASA scientists showed that 2017 was the second warmest year on record, with global average temperatures across land and sea surfaces measuring 1.62 degrees Fahrenheit (0.90 degrees Celsius) above average temperatures from 1951 to 1980.

2017 was 1.12 degrees Celsius above late 19th century temperatures, according to Gavin Schmidt, who directs NASA's Goddard Institute for Space Studies.

The result come in a big year for global climate diplomacy as countries seek to hew to the Paris climate goals of holding warming below 2 or perhaps 1.5 degrees Celsius above preindustrial levels.

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The trend is seen most dramatically in the Arctic, NASA says, as sea ice continues to melt.

The upward trend in global temperatures marked by record-shattering warmth in 2015 and 2016 kept pace previous year, with the United Nations weather agency warning Thursday that the continued pressure on the Arctic in 2017 will have "profound and long-lasting repercussions on sea levels, and on weather patterns in other parts of the world".

The years 2014, 2015, and 2016 had set new all-time temperature records in stepwise fashion - culminating in a dramatic new high in 2016 - and NASA and NOAA hadbothagreed on their rankings as they occurred. What really matters is the clear warming trend, he said.

Average surface temperatures in 2017 were 1.1 C above pre-industrial times, creeping towards a 1.5 C ceiling set as the limit for global warming by nearly 200 nations under the 2015 Paris climate agreement. Arizona, Georgia, New Mexico, North Carolina, and SC had their warmest years on record.

Consistency between independent analyses of the planet's temperatures should increase confidence in such data. The findings are nearly definitely due to climate change, the scientists said, which is predominantly caused by greenhouse gas emissions created by people.

The release of annual temperature measurements can be used to inform policy makers and business leaders when they make decisions about climate change mitigation.