The concentration of carbon dioxide in the atmosphere rose from 405.5 parts per million in 2017 to 407.8 ppm in 2018.
The World Meteorological Organization found the annual increase in another greenhouse gas methane was the highest since 1998.
The figures come ahead of the U.N. climate change summit in Madrid next week.
Greenhouse gases in the atmosphere hit a new record in 2018, exceeding the average yearly increase of the last decade and reinforcing increasingly damaging weather patterns, the World Meteorological Organization (WMO) said on Monday.
The World Meteorological Organization found the annual increase in another greenhouse gas methane was the highest since 1998.
The figures come ahead of the U.N. climate change summit in Madrid next week.
Greenhouse gases in the atmosphere hit a new record in 2018, exceeding the average yearly increase of the last decade and reinforcing increasingly damaging weather patterns, the World Meteorological Organization (WMO) said on Monday.
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