Global carbon dioxide (CO2) emissions reached an all-time high in 2010, rising 45 per cent in the past 20 years. Rising rapidly between 1990 and 2010, global atmospheric CO2 levels totaled 33 billion metric tons last year, according to a report published by the European Commission’s Joint Research Center and PBL Netherlands Environmental Assessment Agency. Global CO2 emissions fell one per cent in 2009, during the Great Recession, but rose at an unprecedented five per cent rate in 2010.