The World Meteorological Organization says the first six months of this year have continued to shatter global heat records, putting 2016 on track to be the Earth's hottest year on record.

The United Nations-linked body said Thursday that June 2016 was the 14th consecutive month of record heat around the planet and the 378th consecutive month with temperatures above the 20th Century average.

The organization said that global warming causing carbon dioxide concentrations, so far this year, have surpassed the symbolic milestone of 400 parts per million in the atmosphere.

"Another month, another record. And another. And another. Decades-long trends of climate change are reaching new climaxes, fuelled by the strong 2015/2016 El Niño," said World Meteorological Organization Secretary-General Petteri Taalas said in a statement.