Nasa: 2017 may be 2nd warmest year on record

Washington, Jan. 22: Last year was the second warmest on record, according to a Nasa analysis which shows a continuing long- term warming trend.

Globally averaged temperatures in 2017 were 0.90 degrees Celsius warmer than the 1951 to 1980 mean, according to scientists at Nasa’s Goddard Institute for Space Studies ( GISS) in New York. That is second only to global temperatures in 2016.

In a separate, independent analysis, scientists at the National Oceanic and Atmospheric Administration ( NOAA) concluded that 2017 was the third- warmest year in their record.

The difference in rankings is due to the different methods used by the two agencies to analyse global temperatures, although over the long- term the agencies’ records remain in strong agreement.

Both analyses show that the five warmest years on record all have taken place since 2010.

Since weather station locations and measurement practices change over time, there are uncertainties in the interpretation of specific year- toyear global mean temperature differences.

“Despite colder than average temperatures in any one part of the world, temperatures over the planet as a whole continue the rapid warming trend we’ve seen over the last 40 years,” said GISS Director Gavin Schmidt.

The planet’s average surface temperature has risen a little more than 1 degree Celsius during the last century or so, a change driven largely by increased carbon dioxide and other human- made emissions into the atmosphere.

Last year was the third consecutive year in which global temperatures were more than one degree Celsius above late nineteenthcentury levels.

Phenomena such as El Nino or La Nina, which warm or cool the upper tropical Pacific Ocean and cause corresponding variations in global wind and weather patterns, contribute to short- term variations in global average temperature.