El Niño-Southern Oscillation

"The long-term warming trend driven by human activities continued unabated," researchers said.
As CO2 in the atmosphere continues to rise, this hot trend isn't showing any signs of abating.
In the U.S., 2016 was a year of record high temperatures. Globally, it'll likely be the warmest year on record.
The "greening" effect has helped slow the rise of CO2 in the air -- but researchers warn it's only temporary.