Levels of CO2 in the atmosphere have surged past an important threshold and may not dip below it for "many generations".
The 400 parts per million benchmark was broken globally for the first time in recorded history in 2015.
But according to the World Meteorological Organisation (WMO), 2016 will likely be the first full year to exceed the mark.
The high levels can be partly attributed to a strong El Niño event.
Read more: CO2 levels mark 'new era' in the world's changing climate - BBC News
The 400 parts per million benchmark was broken globally for the first time in recorded history in 2015.
But according to the World Meteorological Organisation (WMO), 2016 will likely be the first full year to exceed the mark.
The high levels can be partly attributed to a strong El Niño event.
Read more: CO2 levels mark 'new era' in the world's changing climate - BBC News
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