A surge in atmospheric CO2 saw levels of greenhouse gases reach record levels in 2013, according to new figures.
Concentrations of carbon dioxide in the atmosphere between 2012 and 2013 grew at their fastest rate since 1984. The World Meteorological Organisation (WMO) says that it highlights the need for a global climate treaty. But the UK’s energy secretary Ed Davey said that any such agreement might not contain legally binding emissions cuts, as has been previously envisaged.
The WMO’s annual Greenhouse Gas Bulletin doesn’t measure emissions from power station smokestacks but instead records how much of the warming gases remain in the atmosphere after the complex interactions that take place between the air, the land and the oceans.
About half of all emissions are taken up by the seas, trees and living things.
According to the bulletin, the globally averaged amount of carbon dioxide in the atmosphere reached 396 parts per million (ppm) in 2013, an increase of almost 3ppm over the previous year.
“The Greenhouse Gas Bulletin shows that, far from falling, the concentration of carbon dioxide in the atmosphere actually increased last year at the fastest rate for nearly 30 years,” said Michel Jarraud, secretary general of the WMO.
Atmospheric CO2 is now at 142% of the levels in 1750, before the start of the industrial revolution.
However, global average temperatures have not risen in concert with the sustained growth in CO2, leading to many voices claiming that global warming has paused.
“The climate system is not linear, it is not straightforward. It is not necessarily reflected in the temperature in the atmosphere, but if you look at the temperature profile in the ocean, the heat is going in the oceans,” said Oksana Tarasova, chief of the atmospheric research division at the WMO.
