US agencies say 2015 was hottest on record, shatters records

NASA: 2015 Was the Warmest Year On Record

WASHINGTON (Reuters) - Last year's global average temperature was the hottest ever by the widest margin on record, two U.S. government agencies said on Wednesday, adding to pressure for deep greenhouse gas emissions cuts scientists say are needed to arrest warming that is disrupting the global climate.

Data from the U.S. space agency NASA and the National Oceanic and Atmospheric Administration showed that in 2015 the average temperature across global land and ocean surfaces was 1.62 degrees Fahrenheit (0.90 Celsius) above the 20th century average, surpassing 2014's previous record by 0.29 F (0.16 C).

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Scientists at the United Kingdom's Met Office and East Anglia's Climatic Research Unit also published data on Wednesday confirming the U.S. agencies findings.

This was the fourth time a global temperature record has been set this century, the agencies said in a summary of their annual report.

"2015 was remarkable even in the context of the larger, long-term warming trend," said Gavin Schmidt, director of NASA's Goddard Institute for Space Studies.

The sharp increase in 2015 was driven in part by El Niño, a natural weather cycle in the Pacific that warms the ocean surface every two to seven years. But scientists say human activities -- notably burning fossil fuels - were the main driver behind the rise.

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US agencies say 2015 was hottest on record, shatters records
LAKE MEAD NATIONAL RECREATION AREA, NV - AUGUST 03: The ruins of the Hannig Ice Cream Parlor are shown in the ghost town of St. Thomas on August 3, 2015 in the Lake Mead National Recreation Area, Nevada. The town was founded in 1865 by Mormon pioneers at the site where the Muddy River flowed into the Colorado River and at one point had about 500 settlers. The town was abandoned in 1938 after the construction of the Hoover Dam caused the Colorado River to rise. The area was once submerged in 60 feet of water but became entirely exposed to the air as a severe drought in the Western United States over the last 15 years has caused Lake Mead to drop to historic low levels. (Photo by Ethan Miller/Getty Images)
UNITED STATES - JULY 30: A severe thunderstorm passes over the U.S. Capitol on Thursday, July 30, 2015. (Photo By Bill Clark/CQ Roll Call)
NEW YORK, NY - AUGUST 17: People enjoy a hot afternoon at the Astoria Pool in the borough of Queens on August 17, 2015 in New York City. The main pool, the biggest in New York City and administered by the New York City Department of Parks and Recreation, sees over 3,000 people on a typical summer weekday. New York city is in the middle of a heat wave, with temperatures in the high nineties and with a heat factor making it feel over 100 degrees. (Photo by Spencer Platt/Getty Images)

"The 2015 data continues the pattern we've seen over the last four to five decades," said Thomas Karl, director of NOAA's National Centers for Environmental Information.

The latest El Niño started in late 2015 and will last until spring 2016. It is among the strongest ever recorded but Schmidt and others say the weather phenomenon played just a supporting role in the earth's temperature rise.


The 2015 data underscores the urgency of cutting greenhouse gas emissions if the world is to hold temperature increases to well below 2 degrees C, the target agreed to by more than 190 countries at climate talks in Paris last December, scientists said.

With the global mean surface temperature in 2015 more than 1 degree C above late-19th century levels, the world is now halfway to the U.N. target, which would require stronger greenhouse gas emissions cuts.

"This announcement should put pressure on governments to urgently implement their commitments to act against climate change, and to increase the strength of their planned cuts in annual emissions of greenhouse gases," said Bob Ward, policy director of the Grantham Research Institute on Climate Change and the Environment in London.

In the United States, some Republican lawmaker and those skeptical of human-caused climate change have pointed to a slowdown in temperature rise after the last powerful El Niño in 1998 as a sign that climate change is not a serious problem.

Republican presidential candidate Ted Cruz said in December at a hearing on climate change science that there had been no significant global warming for the past 18 years.

NOAA's Karl said that with two back-to-back years of record warming, likely to be followed with a third next year, any doubts that have been raised by skeptical lawmakers about a pause in global warming can be put to rest.

"There is no sign of a pause and slowing," Karl told reporters Wednesday, adding that it is a safe bet that 2016 will break the 2015 record given the long-term trend and the impact of El Niño in the first quarter of the year.

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