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The UN weather agency says 2014 is currently tied for the hottest on record.

RON CHAPPLE STOCK

With temperature data showing 2014 currently tied for the hottest year on record, the UN weather agency on Wednesday rejected claims that global warming has paused.

(Read the WMO's statement on 2014's weather trends here.)

The World Meteorological Organization said the global average temperature in January-October was 0.57 Celsius above average, the same as in record hot year 2010. Parts of the planet were cooler than average, including large areas of Canada, the United States and central Russia. But most of the world experienced temperatures above average, with heat waves in South Africa, Australia and Argentina in January and in large parts of South America in October, according to the WMO assessment.

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"The provisional information for 2014 means that 14 of the 15 warmest years on record have all occurred in the 21st century," WMO Secretary-General Michel Jarraud said in a statement. "There is no standstill in global warming."

In Lima, delegates from more than 190 countries are trying to lay the groundwork for a global emissions pact that's planned to be adopted next year. Divisions between rich and poor countries have slowed the negotiations over the years, but a U.S.-China emissions deal last month has injected new hope into the talks.

"The fact that we're tracking towards the hottest year on record should send chills through anyone who says they care about climate change – and especially negotiators at the UN climate talks here in Lima," said Samantha Smith of the environmental group WWF.

THE LONG-TERM FORECAST: 'UP, UP, UP'

Climate skeptics point to a perceived hiatus in the temperature rise since 1998, an exceptionally hot year, to support their claims that man-made warming is not a big problem. Most climate scientists reject that idea. Michael Oppenheimer of Princeton University said the long-term warming trend is combined with natural variations that tend to be cyclical, with a period of lower-than-average warming followed by a period of rapid warming.

"Whether such a period is about to begin, we cannot say but the warm 2014 is a reminder that the warming never stopped and the long term trend is up, up, up," Oppenheimer said.

The WMO assessment was based on two global data sets from the U.S. and one from Europe.

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WORRYING TRENDS IN THE OCEANS

Ocean temperatures were particularly high in the northern hemisphere from June to October.

"Around 93 per cent of the excess energy trapped in the atmosphere by greenhouse gases from fossil fuels and other human activities ends up in the oceans. Therefore, the heat content of the oceans is key to understanding the climate system," the WMO said.

OTHER HIGHLIGHTS

Storms: By Nov. 13 there had been 72 tropical storms, well below the average of 89. While scientists are now 95 per cent certain that the temperature rise since the middle of the 20th century is mostly man-made, they can't say with the same confidence how the warming affects different parts of the climate system, including the frequency of tropical storms or hurricanes.

Sea ice: Arctic sea ice shrunk to the sixth lowest level on record in September, while Antarctic sea ice grew to a record extent for the third straight year.

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CO2: The concentration in the atmosphere of carbon dioxide, a key greenhouse gas, rose to a new high of 396 parts per million last year, the WMO said, 142 per cent above the level before the industrial revolution, when people started burning fossil fuels for energy. Figures for 2014 were not yet ready.

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