(Bloomberg) -- Earth experienced its hottest half-decade onrecord between 2011 and 2015 and the floods, droughts and stormsunleashed by rising temperatures are likely only a prelude to newweather extremes, the World MeteorologicalOrganization (WMO) said.

As delegates from almost 200 countries gather in Marrakesh,Morocco this week for global talks on climate change, the WMO report published on Tuesday shows the worldhas already warmed by 1 degree Celsius (1.8 Fahrenheit) compared topre-industrial levels.

“We just had the hottest five-year period on record, with 2015claiming the title of hottest individual year,” WMOSecretary-General Petteri Taalas said in a statement. “Even thatrecord is likely to be beaten in 2016.”

The WMO’s measurements underline the difficultly countries facein mitigating runaway global warming. While they agreed inDecember in Paris to keep temperatures increases well below 2degrees Celsius (3.6 degrees Fahrenheit) the new data showcountries left themselves a narrow margin of error as greenhousegases continue to accumulate in the atmosphere.

Global 5 year average temperature anomolies

The warming trend may have been responsible for a drought in EastAfrica between 2010 and 2012 which led to about 258,000 deaths, aswell as flooding in southeast Asia in 2011 that cost more than $40billion, the report said. Superstorm Sandy in 2012 caused $67 billion indamage to the U.S. and almost 8,000 people were killed by TyphoonHaiyan in the Philippines.

Rising ocean temperatures and ice sheets melting have beencausing sea levels to rise, the WMO said. Average sea-surfacetemperatures in 2015 rose to a record, feeding into oceanexpansions triggered by warming water, it said.

Areas covered by Arctic sea ice over the five-year period was 28percent below the average of the previous 29 years, the WMOreported. Sheets of white ice at the Earth’s poles havehistorically had a cooling effect by reflecting solar rays backinto the atmosphere.

Extreme weather

Despite the Paris Agreement signed in December, the worldremains on track for 3.4 degrees Celsius of warming, according to aUnited Nations report last week. Countries must identify how theycan make further cuts of at least 12 gigatons of carbon dioxideequivalent, which is the same as taking all of Europe’s cars offthe roads for 12 years, it said.

Related: A white-hot Christmas wraps up Earth's hottest yearon record

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