Not only was 2015 the warmest worldwide since 1880, it shattered the previous record held in 2014 by the widest margin ever observed, said the report by the National Oceanic and Atmospheric Administration.

"During 2015, the average temperature across global land and ocean surfaces was 1.62 Fahrenheit (0.90 Celsius) above the 20th century average," said the NOAA report.

The US space agency NASA, which monitors global climate using a fleet of satellites and weather stations, confirmed that last year broke records for heat in contemporary times.

NASA said that the temperature changes are largely driven by increased carbon dioxide and other human-made emissions into the atmosphere.

Last year marked the fourth time a global temperature record has been set this century.

Moreover, the latest finding adds to a steady rise in heat across land and sea surfaces that have seen records repeatedly broken over the years.

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