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2016 was the hottest year on record – again

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01:22 - Source: CNN
2016: The hottest year on record

Story highlights

2016 set a global heat record for the third year in a row

A record El Niño played a role in pushing the planet's temperatures higher

Scientists say humans are the main cause for the warming

CNN —  

Last year was officially the Earth’s warmest since record-keeping began in the 1880s, the World Meteorological Organization announced Wednesday morning.

That means 2016 set a global heat record for the third year in a row according to NOAA and NASA, who held a joint press conference on Wednesday to discuss the record.

Not only was this the third consecutive year to rank hotter than all previous years, it also means 16 of the 17 hottest years on record have occurred since 2000, according to NOAA. To put this in perspective, the last time we had a record cold year was 1911.

Temperatures over the Earth’s continents and oceans in 2016 were 1.1 degree Celsius (1.98 degrees Fahrenheit) above the pre-industrial average, according to the WMO. That means we are already a majority of the way to the 1.5-degree warming goal set at the Paris Climate Agreement in 2015.

Climate scientists say greenhouse gas pollution, which humans are creating primarily by burning fossil fuels and chopping down rainforests, likely contributed to the 2016 record.

And the pollution certainly is behind the long-term trend toward warming, scientists say.

“(T)he spate of record-warm years that we have seen in the 21st century can only be explained by human-caused climate change,” said Michael Mann, director of the Earth Science Center at Pennsylvania State University.

“The effect of human activity on our climate is no longer subtle. It’s plain as day, as are the impacts – in the form of record floods, droughts, superstorms and wildfires – that it is having on us and our planet.”

Humans are contributing to warming

A record El Niño lasting from 2015 into 2016 played a role in further pushing the planet’s temperature higher. El Niños are weather phenomena that warm the Pacific Ocean and pump lots of excess heat into the atmosphere, raising global temperatures.

But El Niño is only one factor in the warming of the planet.

And climate scientists say it is a relatively small one when compared to the role that humans are playing.

“The record is due to a combination of the (natural) strong 2015-2016 El Niño (warming of the tropical Pacific Ocean surface) and the strong global warming trend that has continued from 1970 to the present,” James Hansen, former director of the NASA Goddard Institute for Space Studies, told CNN.

But “the human-caused, long-term warming trend is the bigger contributor,” he added.

To come up with its figures the WMO combined different global temperature datasets from various sources, including NOAA, NASA, the UK Met Office and the European weather and climate center, ECMWF.

Despite using different methods to compile and analyze the temperatures, all those agencies reached the same conclusion – that 2016 “continued the long-term trend of warming we have seen since the 1970s … and have not paused in any way,” said Gavin Schmidt, director of NASA’s Goddard Institute for Space Studies.

Arctic is warming faster

While the warming for the planet was just over 1 degree Celsius, the Arctic continued to warm much faster, with temperatures more than 3 degrees Celsius – 5.4 degrees F – above what they were in previous decades.

“The Arctic is warming twice as fast as the global average” according to the WMO Secretary-General Petteri Taalas, and “we have also broken sea ice minimum records in the Arctic and Antarctic.”

The polar warmth is not just a problem for the polar bears, it lead an entire village in Alaska to vote to relocate.

And the impacts extent much further.