In its annual report on heat-trapping gases in the atmosphere, the U.N. weather agency also pointed to signs of a worrying new development: Parts of the Amazon rainforest have gone from being a carbon "sink" that sucks carbon dioxide from the air to a source of CO2 due to deforestation and reduced humidity in the region, it said.
The findings come as WMO, in its annual report on heat-trapping gases in the atmosphere, said concentrations of carbon dioxide, methane and nitrous oxide were all above levels in the pre-industrial era before 1750, when human activities "started disrupting Earth's natural equilibrium."
"The Greenhouse Gas Bulletin contains a stark, scientific message for climate change negotiators at COP26," World Meteorological Organization Secretary-General Petteri Taalas said of his agency's report. "At the current rate of increase in greenhouse gas concentrations, we will see a temperature increase by the end of this century far in excess of the Paris agreement targets of 1.5 to 2 degrees Celsius above pre-industrial levels."
The global average of carbon dioxide concentrations hit a new high of 413.2 parts per million last year, according to the WMO report. The 2020 increase was higher than the annual average over the last decade despite a 5.6 percent drop in carbon dioxide emissions from fossil fuels due to COVID-19 restrictions, WMO said.