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Record surge in atmospheric CO2 seen in 2016

Concentrations of CO2 in the Earth's atmosphere surged to a record high in 2016, according to the World Meteorological Organization (WMO).
Last year's increase was 50% higher than the average of the past 10 years.
Researchers say a combination of human activities and the El Niño weather phenomenon drove CO2 to a level not seen in 800,000 years.
Scientists say this risks making global temperature targets largely unattainable.
This year's greenhouse gas bulletin produced by the WMO, is based on measurements taken in 51 countries. Research stations dotted around the globe measure concentrations of warming gases including carbon dioxide, methane and nitrous oxide.
The figures published by the WMO are what's left in the atmosphere after significant amounts are absorbed by the Earth's "sinks", which include the oceans and the biosphere.
Climate change: a guide
A brief history of Earth's CO2
Global Change Calculator
2016 saw average concentrations of CO2 hit 403.3 parts per million, up from 400ppm in 2015.
"It is the largest increase we have ever seen in the 30 years we have had this network," Dr Oksana Tarasova, chief of WMO's global atmosphere watch programme, told BBC News.
"The largest increase was in the previous El Niño, in 1997-1998 and it was 2.7ppm and now it is 3.3ppm, it is also 50% higher than the average of the last ten years."
Line chart showing rising carbon dioxide levels since 1960
El Niño impacts the amount of carbon in the atmosphere by causing droughts that limit the uptake of CO2 by plants and trees.
Emissions from human sources have slowed down in the last couple of years according to research, but according to Dr Tarasova, it is the cumulative total in the atmosphere that really matters as CO2 stays aloft and active for centuries.
Over the past 70 years, says the report, the increase in CO2 in the atmosphere is nearly 100 times larger than it was at the end of the last ice age.
Rapidly increasing atmospheric levels of CO2 and other gases have the potential, according to the study to "initiate unpredictable changes in the climate system... leading to severe ecological and economic disruptions."

http://www.bbc.com/news/science-environment-41778089