|UN says CO2 levels at annual high|
|News - St Augustine Area & St Johns County|
GENEVA — Carbon dioxide levels in the atmosphere reached a record high in 2013 as increasing levels of man-made pollution transform the planet, the U.N. weather agency said Tuesday.
The heat-trapping gas blamed for the largest share of global warming rose to global concentrations of 396 parts per million last year, the biggest year-to-year change in three decades, the World Meteorological Organization said in an annual report.
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